I've always avoided the Fighting Pool on my Melee characters, especially Tanks. I already have a set of Melee attacks, Tough is redundant, and Weave might be nice to have but isn't necessary. But since we can now skip our Tier 1 secondary power, it's a little easier to fit in the Fighting Pool, and having another AoE attack (Cross Punch) would be nice..
So I finally added the Fighting Pool to my Inv/SS Tank. Cross Punch does almost as much damage as Haymaker, but can hit up to five targets- that's great! And it recharges just as fast as Haymaker. Also it can Stun and Knockdown targets. Cool. But wait there's more- every target you hit increases your Recharge and ToHit for six seconds! It's weird how much this attack does.
I used to have Spring Attack from the Leaping Pool. It's a fun way to enter a fight, does decent damage, but has a very long recharge. I kind of wish I could stick with Spring Attack, but Cross Punch is just too good. So you win, Fighting Pool.