...Because the demo wasn't indicative of the full game?
I'm having a great time playing co-op with my finacee. That eliminated 1/2 of your issues. Furthermore, the game is something called 'fun'. You may forget that it's a critical part of a game, but review scores aren't indicative of 'fun' which may be the reason the Wii is hammering the PS3 in terms of software, despite worse review ratings.
Weapon upgrades, inventory management, co-op gameplay, plot & pacing are all very good, and is one of the most visually-appealing game I've seen in awhile. I am enjoying the game more than Gears of War 2, so I think that the rating is not indicative of what the game fully brings to the table. Not everyone will think it's great, but if we went only by demos, then half the games out there wouldn't be purchased.
Back from the dead, I'm afraid.
