Hm... Works well against Infernape and most Celebi. Besides that, I don't see it being very useful defensively because Electric, Water, and Grass are almost always paired with Ice just because of the presence of the other Dragons. Flying is like the only type on this list that doesn't combo well to get an SE on the type combo.This combination is actually starting to appeal to me in both a fanboyish and competitive way.
3 2x weaknesses isn't bad.
And having 4x resistance to Electric is something to get excited about.
Resistances:
Fire, Grass, Water, Electric (4x), and Flying.
Quite decent actually.
You could wall Heatran, until he gets smart and Earth Powers / HP Ice's you.
Infernape can just Close Combat you for much more damage than on Salamence.
All bulky Waters and most offensive Water types run Ice Beam, so you can't wall them.
If you had Recover, you could probably Stall Celebi, until it CM's in your face.
Almost all Electric-types run HP Ice.
Only Flying types don't run a super-effective back up move.