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Dragon/Ice leaves it with five weaknesses, all common attacking types (Fighting, Rock, Steel, Dragon, Fairy) and just three resistances (Water, Grass, Electric) one of those being not particularly useful.
Primary attacking stat is strong with a base Attack of 170, but it has no good STAB physical Ice move to make use of that. In fact the only physical Ice type move it gets its Freeze Shock which is a charge move like Sky Attack and thus not worth using. Its other STAB recieved a nerf in Gen 6 across the board and the best attacking move there (Outrage) is basically asking your opponent to bring in a Fairy for free.
Sub-100 Speed.
Ability doesn't mesh all that well with its typing. Not-Mold Breaker is useful to have but helps some things far more than others. For example, Ground types benefit greatly from ignoring Levitate. Ice/Dragon doesn't really give nearly as much of a shit about abilities. Bypassing Sturdy is always good but then most Sturdy users can hit you for SE damage.