Bitching about connection problems on a pre-release demo is a bit pointless
That being said the game does unfortunately feel very sub-par. The graphics are rather poor, controls wonky and gameplay does not feel smooth or satisfying. The demo was a lot of fun though, then again almost every game is fun for the first hour or so.
Marine flashlight is useless and comes turned on as default. Best to just turn it OFF. Basic weapon is too inaccurate at long range. Aliens have a huge advantage as they move so quick you have no hope of hitting them. The only way to get kills as a marine is to get lucky with the grenade launcher, stumble on someone who doesn't know what he is doing or get in a good shot with the sniper rifle which is hard to find. Predator is over-powered when you get the mines and other weapons for him. Alien controls are wonky but they are overpowered as it is impossible to see them in the dark level as a marine and they can move behind you faster than you can get in the shots to kill them. Aliens also have too much HP.
Unless the other game modes are more balanced and fun I think the game will end up getting reviews in the 50-70% range. A shame.