I was wondering why you were online playing Infinite last night. I've actually deleted my copy of Infinite for the time being. I'll put it back in once the 2nd part of the DLC comes out and I'll try it all in 1 swoop.
Here's some VERY early impressions of Aliens: Colonial Marines. I have to say that it appears that the massive patch (but let's be honest, they just rebuilt the game) did remove most of the more glaring issues people complained about, but it isn't perfect. I've seen a few AI issues, but nothing I would consider noteworthy, except for one time when I was running with my partner and for whatever reason the guy kept checking a door we had passed. I just kept going and then eventually he came out of nowhere and ran ahead of me. Speaking of "running," the way characters run in this game is embarrassing. It doesn't as much look like they're running, but rather they're in a running animation and the character floats (it's hard to describe without seeing it.)
Still, when the game works, it works. I've always felt that Aliens is one of the scariest movies ever made, because it is that perfect combination of uncomfortability, tenseness, as well as jump scares. The game reminds me quite a bit of Doom 3, which I really liked because of the atmosphere and the tenseness added by forcing you to hold a flashlight to see everything and not hold a weapon at the same time, but in this case replace flashlight (as you can have that on whenever) with the motion detector. It's cool to walk around with the tracker on to then have pulses come up and track them coming after you, very similar to how the movie worked. Still, this isn't foolproof as many aliens will simply be still until you get close and then jump at you to give you a sloppy kiss. Speaking of, the aliens are quite tough if you're not paying attention. Aliens will often jump right at you and deal much damage very quickly, not to mention you have to get out of the way after you kill them so you don't get burned by the acid. So fighting the aliens is tense and fun, but what ISN'T fun is fighting other humans. Yup, Weyland-Yutani comes down to wipe you out and hide what's going on, and fighting them is very dull. Then the game devolves into a standard FPS.
One final note is that I think we may need to scrap our plans to do online 4 player co-op with this game. People have mentioned that the co-op system is very tacked on, and the game is CLEARLY not designed to have more than 4 people at a given time. This isn't like Left 4 Dead or Gears of War 3, where the levels and such are designed to handle multiple people with big open areas. From what I can tell, the levels here are dark and claustrophobic, and the alien count is designed to deal with the fact that not many guns are there (I don't know if the enemy count changes with more people playing). Seeing as we can have up to 7 people (4 players and 3 AIs) it will likely kill some of the tenseness and subtlety if the aliens are facing numerous guns and they have no long distance weapons to fight back with. I can't see this being a pleasurable experience with more than 3 people playing. 2 would likely be a good number, with 3 pushing it a bit unless you up the difficulty.
I'll keep pushing through and see how this all turns out. I'm not expecting this game to surprise me and be a late entry in my GOTY list, but at least it looks like I don't have to fight through bugs to be able to experience the actual game, which was a big problem I had with the Medal of Honor reboot.