You mean there is someone out there not using supergrenade C4?
C4's lethal range is about one step in game larger than a frag grenade's.
Its not a supergrenade. Its just more useful because the maps are so tiny.
The issue is not the lethal range. If it was only a trap, I would be perfectly fine with it. But it is not. Both frag and semtex have a detonation time. Even if you master them, you are still making the best approximate calculation you can. C4 has a remote detonation. You detonate it as soon as it gets anywhere near an enemy. It even has a shortcut for detonation. Those factors makes it more effective than both grenades because you have the most control AND the best lethal range.
The times I get killed by a C4 as a trap make me cringe and grin at the same time - I am basically thinking that cheeky bastard (both a compliment and an expression of irritation). The times I get killed by C4 as an airburst grenade make me think Home, all the way right, all the way down, A, up, A.
I can run from semtex, I can run from frags or throw them back, with C4 I can only tank it. Getting killed by grenades is mildly annoying but sometimes funny. Getting killed by C4 makes me want to quit. C4 as it stands right now, is a huge drag on the game from a fun AND competitive perspective.
Also, the small map size in general makes ALL explosives more useful and effective so that is a moot point.
imo they are weaker than previous CoD's.. but not useless by any means. i still gets tons of kills with my frags and semtex. i prefer frags cause im a pro chef.. but they both are pretty good. c4 is definitely better, but i still love muh nades!