Actually, the Clark RDX is one of the most misconstrued weapons in the game. At one point I was 80 or so in the global rankings with it (dropped down now to 111 due to a lack of recent use).

For starters, it will detonate a recon's RDX. Unfortunately, it will only do so when the RDX is placed on a vehicle. Obviously not as great, but at least it has the remote possibility of being useful. The clearing mines has already been commented on. For the record, the Clark RDX would never stick to an infantry, before or after the patch.

Anyway, the thing about the Clark RDX is it has to be used with the right mentality. It also takes a lot of understanding of the flow of the game to use effectively. If I take it onto any kind of an assault/defend map where one team has a ucb and the other does not, I can consistently get 4-8 kills with it, most of which I would not have been able to do with grenades.

1) Accuracy. It is not an easy weapon to learn to shoot well. It takes time and practice.
2) Arch. You have to understand the trajectory of the weapon. Once you do you can learn to place those glowing balls of christmas cheer in places you couldn't reach with a grenade.
3) Prediction. Use it in conjuction with an IDS or UAV. Learn not just where the troops are standing, but where they are going.

Once you have these three elements in place, you can start to do some damage. Here is how I've found to use it best.

- Place rdx shots behind a corner someone is about to run around. If you do it right they'll die almost instantly due to two rdx balls blowing up in quick succession.
- Place rdx shots on walls, ceilings and other unexpected places. Belgrade is a great example. If there's a guy in the building above you, hit the roof. He might hear the hiss but he won't see the ball unless he's looking the right way
- When possible, find targets who are focused on other things. Snipers and support campers are great victims
- Fire from cover. You can frequently hit your enemies without even being visible due to the arc of the weapon