I got the game on sale, and have been playing it a bunch. Overall, it's pretty good, but there are definitely some things that could stand improvement.
First, I'm gonna have to try that unplugged Xbox controller thing, in case my controller is currently plugged in. I've definitely noticed the video/audio sync issue. I didn't expect the game to look gorgeous on my 2010-era PC, but I'm pleased with how it does look.
Gameplay-wise, though, there are some definite issues.
1. The new in-cover system is nice, but it's a bit wonky. I understand that not seeing line of sight (LOS) indicators from enemies you haven't spotted yet means you can turn a corner into an "OH SHIT!" scenario, but I've had some instances where the "visible" indicator didn't appear when the enemy in question was spotted (but not by the soldier I was moving).
2. There are some other weird bugs/glitches from time to time. I had a snake man tongue-and-wrap a soldier of mine, but they were physically below the map. this has only happened once, but it was weird. They were still targetable, so I got my guy out, but damn. That's quite an oversight. Probably because I have an ATI card, and everyone shits on ATI nowadays.
3. I find the health bar thing to be irritating. The damage indicator for the weapon will say "4-6 damage", but the health bar when you're targeting will show all 6 bars. I think it'd be better if the health bar would show, like, 4 bars in red, and the remaining two in orange or something, to indicate those aren't guaranteed. (Yellow already applies to armor, and seems to also apply to crits.)
4. There are some serious bullshit mechanics in the game, like "Dodge Grazed." The game doesn't indicate that this is a risk, or which enemies can do it, or how it works. It just ends up being another mechanic that the game uses to fuck you. Now, if this comes from, like, an Avatar project advancement or something, ok, fine, my bad for not noticing it. But if it's just one of those "Surprise! The game got harder!" things, I think it's bullshit. It should be more transparent, at least, or apply by enemy type. While I dig that the game does advance the enemies over time, I find that it's not really transparent enough about what's happening and why. Maybe a notice from Tygan that "It looks like these enemies have been enhanced. I'll update the autopsy report from before," at which point it'd list what Advent has done to improve them.
5. There are other mechanics that just...don't really work. Say, did you know that there's the ability to bleed out before you die in this game? No? That's probably because it NEVER TRIGGERS. It's apparently tied to this calculation involving willpower, which means that, at best, a Colonel has a 50% chance of bleeding out, but a Rookie is guaranteed to die. Why? Willpower.
There's also the "wounded"/"gravely wounded" calculations. These seem off. You have your soldier's base health, which can then be increased by armor types (e.g., nanovest, E.X.O. armor, etc.). Then on top of that you have actual armor which basically just mitigates damage. Fine and dandy. But why is it, then, that if my armor-enhanced health takes damage that is all still ABOVE my base health, I'm indicated as wounded? I didn't suddenly get "healthier" by putting on the armor. I was "protected." So, how is my ARMOR taking hits being counted against me? Stuff like that I find to be more of just the Xcom attitude of "We stack the deck against you because, fuck you, that's Xcom, baby!" I'm all for difficulty, but I prefer FAIR difficulty, not "Fuck you" difficulty.
6. The timers could be a bit more generous. I don't mind having timers on a mission, but in some cases, the game is just full of shit on this. 8 turns to cross what is at least 5 turns' worth of movement alone, and you're throwing 11 enemies against me? Screw that. That's artificial difficulty that basically forces you to charge into the jaws of near-certain death. I downloaded a mod that allowed me to change the amount of turns. I increased it by four for most missions. In some cases, especially early on, it does make the turns basically negligible, but in others, I find it just makes them more fair, given the number of enemies out there.
7. There are definitely some "Are you KIDDING ME?!" moments in the game. I find the terror missions to be particularly bad, given how close to the civilians the aliens usually are, and how far my guys are from them. Like, within my first two turns, the aliens can usually kill between 2-3 civilians with ease, just because they spawn next to them. My recollection of EU/EW is that terror missions usually featured a bit more of an even mix of civilians across the map. But then, to be fair, terror missions were always my least favorite missions in any iteration of X-com or its clones.
The really GOOD news is that a ton of this stuff is moddable, and the community is rising to the task.
Outside of that, the game is a ton of fun. I did my first facility raid the other night (in a game I was bound to lose, but I did it anyway), and it was a blast. I had my one stealth ranger basically avoid all the enemies, while the rest of my 6-man team took out everyone they could (including a hacked level 2 MEC). She got into the building, armed the device, and then OH SHIT, triggered a pod of 2 sectoids and a codex, who were then reinforced by an officer and a stun baton guy, and a shield dude. Everyone else was dead by then, so my team dug in to heavy cover, dropped the evac zone near them, and I had my ranger haul ass across the ground while everyone else provided cover. the ranger took some hits, but my squad medic got her back up and running, and everyone managed to escape (albeit with two wounded). Great mission, though.
One piece of advice for folks: read up on things like base design, and DO NOT delay building Resistance Comms, or you won't be able to contact additional regions where enemy Avatar sites pop up.