highest burst melee? between Frost dk and Ret pala.
Most dangerous if played properly with extremely well executed burst? Tie between Feral and Arms Warr(believe it or not, I've seen a feral (Post UW nerf) drop healers in a single maim while the healer had no cd's, and I can expand on this, if the feral is playing with a high pressure partner, say an UH DK who can force healer cooldowns alone, you just suddenly start seeing the full potential of any burst class played properly, I see no point in using cooldowns into PS, infact I see no point in bursting at all up untill I feel I can kill somethin, that's why I'm playing at 2964 rating atm, and the quickburst teams are all stuck at 2.4k max.
Well, I still have to see what fury warriors have to offer, not many of them currently pvp, but arms warriors burst can be sometimes ridiculously high.