I' m actually incredibly disappointed with it. I' ve had it now for a day, & other than the improved visual style, & the returning of grenades, it seems like everything else has been downgraded on single-player.
Pro' s-
Revamped character models.
Better cinematic quality.
Better triggered events.
Tossing back grenades.
Vehicles
Cons-
Bad firearms. They' re either historically incorrect looking/sounding, or painted poorly. They took massive liberties with many of the ironsights. The Browning Automatic looks like a pea-shooter, & I swear the stock on the Thompson is shiny.
Dumb AI. You throw a grenade behind a pile of boxes to flush out the enemy, & they try to take it like a flick on the ear. Not very realistic. Enemies don' t use cover, every time I see them, a good 1/6 of them is sticking out from around the wall, an easy target. Friendly AI isn' t all that good either. Crouch, shoot at the targets, & move on when you do. Not much else.
On-Rails gameplay. They' re trying to tell me that I can' t explore the rest of the level because I can' t mount a 3 foot wall.
It kills the frenzied pace right away when you realise you' re just being funneled through the maps.
I haven' t played the multiplayer yet, so I can' t comment on that, but it really is disappointing compared to CoD2. For shame Treyarch, for shame.[:' (]