Ah for PvP - it has good burst with some pretty big insta cast winner like fireblast, blastwave, dragon's breath. Unfortunately, overall survivability and utility is lower IMO. If i have the opportunity to stand back and deliver, I can unload nice damage, but that's fairly rare especially in arenas. A deeper Arcane spec would provide PoM (for poly or pyro), and improved CS, and deeper ice provides Ice block/barrier, water ele, and shatter which are all very useful in PvP.
Still against many pvp opponents, skill > gear or talents and I find myself fairly satisfied with my pvp performance. That being said generally the more accepted pvp specs are (arc/fire/ice):
33/28/0 (scorch centric, pom and imp CS)
40/0/21 (pom, imp CS, arc dmg talents + ice block, shatter)
xx/xx/41 (ice block, barrier, shatter, water elem)
Most of this info is from reading TBH, I've been deep fire all the way on Hagumi.