In Drop Zone it works wonders.  Had a game yesterday where that helped me get more than half of my kills.  I left that match with 3 double kills and 2 triples from using C-4.  Made my day. 

i can't tell you how much i love c4.  i have 254 kills with it so far and i have like 30 multiple kills with it.  It took some time to get good at throwing it quickly on the fly but once you get it down, it is easy as hell.  i haven't done much planting, but i will learn soon.  throwing it through windows or over walls is my area of expertise.  don't remember how i got along without it.

Yeti

Haha, it's pretty funny to use. I liked it in COD4 and Blops when you had two of them.

Since I started using C4 I haven't looked back. I'd never use any of the other lethal equipment over it. It can be thrown like a grenade aswel as over objects and into rooms. C4 is a campers nightmare. I've got 5,600+ kills with it, just outside the top 200 in the world. Feels good to get those double, triple and multikills with it.

Here's a few clips showing how good C4 can be :-

http://www.youtube.com/watch?v=xgbbzYevwVE&feature=plcp

http://www.youtube.com/watch?v=WwNG7xhEN0k

http://www.youtube.com/watch?v=JnooRCekuSs&feature=plcp

1 of the clips shows how far C4 can be thrown to get kills.

Some of my favorite c4 moments