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The +15% crit damage applies to both melee and ranged and will make Khajiit undoubtably the most favored Melee and Ranged-class (non-caster) in the game. If you want to be in the top corner of being the most viable damage dealer, then you will not come around choosing a Khajiit.
If Carnage stays only on Khajiits, then we will see them running around everywhere. I personally do not mind, since I like Khajiits. But is this really the goal which will automatically add up to that each competitive player will pick this race, when playing melee and/or with a bow?
Everyone saying that race bonuses are marginal were not yet participating in the endgame. Having a few thousands of health and getting added 12% hp from the imperial ontop will find this number very appealing. Same goes for all the other bonuses that really have impact. Khajiit being one of them.
Is it really unimportant what race to pick? No, definitelly not. Sure you can pick an Argonian Nightblade but will be outplayed by a Khajiit by a large number. Same goes for a Bosmer, and that is the sad thing - Bosmer actually being a Bow focused race will also be outplayed by the Khajiit's racials.
How to fix this? Balance racial bonuses across the board. To make on single example out of many: This would then mean to give Khajiit's Carnage to one or two more races aswell.