B2 garbage?

B2 is excellent in arena. The main point, as mentioned above, is that he has an AOE dispel and pre-emptive de-buff, and he gets lots of turns to apply these. When most teams have taunters, or dual taunters, B2 deals with these so that you can focus your team on killing Rey, etc. without interruption. Same thing with offence-up and advantage (QGJ, Dooku, Phasma) - B2 dispels all of these or prevents them from happening, and the opposition is much less dangerous without these damage increases.