Uh, if you're using one in game, that's a whole different story than using one competitively. Also, Lapras has a semi-usable set, especially if OHKO moves are allowed on XY's rated battles. --- I'm an Atheist, and I'm damn proud of it. If that offends you for whatever reason, shoot me a PM and I'll correct your misconception.
Correction: Ice Types are bad DEFENSIVELY. Offensively, however, they're great. --- "Many of you feel bad for this lamp...That is because you're crazy. It has no feelings! And the new one is much better." (IKEA's Lamp commercial)