SCREW THOSE THINGS GOD DAMN. Too many fine young men or dang dummy were lost to those damn things. Even worse half the time I'm wearing shock armor and completely forget to use it.
 
The games great and fun and free so PLAY IT! Just watch out for dummy's and mic nazis yeesh. 
 
WELD THAT DOOR! PUT THE SENTRY HERE!  OH MY GOD WHYD YOU PUT IT OVER THERE!  
 
Chill out man ill just pick it up and turn it around and- 
 
BAM KICKED 
 
For Christ sake give me a chance but oh wait never mind I forgot you're a goddamn PSYCHO! 
 
Since it's free there are A LOT of dummy's as in no one ever sticks together and watch each others back. I'm being drowned in aliens and my bonehead squaddie watches me die cause I had to reload. 
 
YOU STICK TOGETHER YOU LIVE TOGETHER ITS THAT SIMPLE! 
 
The leveling up system is fine and the weapons are great. Flamer and Tesla weapon bros for life. 
 
The classes are distinct and fun in their own way. The officer gives a leadership buff and has a sweet shotgun. the weapons specialist use the big guns and cuts a path. The tech hacks open and welds doors shut cutting off alien attacks. Finally the medic help keeps EVERYONE ALIVE and is the only one that can combat the PARASITE INFECTIONS. 
 
Also some missions require the tech to survive to achieve the objective so many a mission were lost due to dummisim.

But when everything clicks together my god its magnificent.  
 
Everyone moving together mowing down aliens like a well lubricated alien death machine. The specialist takes the front chopping down aliens. The officer watching the rear and the medic and techie keeping the flank clear. 
 
It was AMAZING much like this GAME and VALVE for making it! 
 
Also mods are going to be awesome.