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There is nothing inherently wrong with it, it simply becomes a wall-breaker rather than a fast sweeper. It has access to swords dance and has respectable bulk so it can function as an effective hammer, though it does need more support than a regular Garchomp before it can do its thing.
Even Ferrothorn can't stay in on it, let-alone switch in safely after a swords dance.
+2 252 Atk Mega Garchomp Outrage vs. 252 HP / 252 Def Ferrothorn: 156-185 (44.3 - 52.5%) -- 21.5% chance to 2HKO
The only really bad thing is the in game model looks like its about to fall backwards.