I'm not a theorycrafter. My reaction is purely intuitive, not based on reading through new traits and skills and looking for synergies, so maybe I'm just missing what the DH and Temp bring to their professions.
Reaper: Cool theme and different play style from what we're used to with necro. Will open up new options in the meta.
Dragonhunter: Basically a flashy, fancy ranger with heavy armor. Won't do much for new play styles, and very little if anything for the meta, with a class that already has a heavy presence in the metagame. Never mind about the name...
Tempest: Based on what we currently know, a whole lot of flash and not much substance. Mechanic is easily breakable, and should not have any impact on the meta at all. Will likely only be fully utilized by eles who like the pretty colors and lights.
So yeah, ANet is 2-2 so far.
That said, elementalist is a very powerful profession as is, so I'm not sure ANet is totally out of line in adding a spec that does not add to that power even further. It's obvious why it pisses people off and won't be used much, but, just saying.