I've read some of them and it's nothing new...from what I see,they complain cryostasis being buggy,boring,corridor shooter or something down that line.
Some ppl want open ended shooter like far cry 2 and hate linear games with very little outdoors action.
Also some ppl are reserved when russian games are concerned...they usually have very good ideas and are ambitious,but the execution is lacking(especially on the gfx side which throws some gfx whores away). not all the time of course and the situation is improving all the time.
After having played cryostasis,I can say it's a good game and has great atmosphere,but it's not 10/10 game...I'd give it 7 or 8/10 or something down that line.