Just finished Battle Field bad company 2 single player, a few thoughts:   
1.Thanks for not introducing the PC gamer who hasn't played the first game to your characters....  
My feelings are summed up in this thread: 
http://www.giantbomb.com/pc/60-94/bfbc2-single-player-makes-me-wish-bc1-was-on-pc/35-426183/     
2. I actually did enjoy the obvious references to MW2, the snowmobile line from haggard was nice. 
3. How many corny cut scenes were necessary with corny epic music 
NO MAN LEFT BEHIND! 
LETS DO THIS, ATTACK THE RUSSIANS GET TO THE PLANE, YOUR NOT A SPECIAL OP! 
 give it a rest...the best Cut scenes were the ones without the corny music and made an attempt at humor, like when the sarge asked everyone who wants to hijack a plane and they raised there hands... Not die hard laughing funny, but humorous and appreciated.  
4. Environment was great! Graphics looked good. Enemies looked pretty good... but some of the white dudes in the game like the army general and the spook have square fake looking heads.  
 
Overall this game is/was worth the buy for the multiplayer experience. The single player is worth a look if you have some free time, but DO NOT buy the game for it only or you will be disappointed.