We don't know whether stealth rock will play a big role in the metagame this time around. As of the moment, SR is not give out as a TM, and only a few precious number of pokemon learn it through levelling up. Furthermore, even if pokemon from the DPPT generation are able to pass over to the BW metagame, the new item Aiming Mark (I believe that's what it is called), helps out greatly spinning away rocks.
Although it's not hard to predict Rotom-H, Rotom-H faced the exact same problem when playing with Choice Specs and Scarf the last generation. It was easy to switch into a resisted Overheat, or Shadow Ball, or an immune Discharge/Thunderbolt, but it didn't slow down the usage of Rotom-H. No one likes to have a Choice Spec tricked onto their pokemon, and when used correctly, Rotom-H can be an effective revenge killer. And plus, don't scoff at a decent 105 SpA.
Defensively, I admit Rotom-H has taken a hit. Being immune to Lucario's Extreme Speed and Close Combat was one of its main points in revenge killing it. A Close Combat will do major damage against it, especially when +2. However, regardless, it still resists many important types, such as Ice (a move more important than ever, when we see the new dragon types introduced), Steel (Scizor's Bullet Punch), Grass (A new addition, especially with the introduction of Ninetales' Drought, giving Chlorophyll pokemon a much better status in the metagame), Fire (Again, Ninetales' Drought raises the effectiveness of fire attacks). Also, it loses a Dark and Ghost weakness, two typings that were prevalent in the previous metagame. I still see Rotom-H being an effective defensive pokemon, especially with status moves like Discharge, and Will o Wisp.
