My only issue with MKX's choice of DLC characters is that it's 50/50, when it really should be more like 75/25 in favour of MK characters.
Personally I have no interest in most of the characters (especially Jason and Tanya) but I understand why they were chosen, and I think so far they're all really well designed and a lot of effort has gone into their gameplay. No complaints, really.
However, an equal number of guest and MK characters? No thanks, and please don't do that again in future.
IMO, the Kombat Pack should either have been:
Predator
Tanya
Tremor
Fujin
OR
Jason
Tanya
Tremor
Fujin
Sareena
Predator
Something along those lines, anyway.
Personally I don't care about Cyrax and Sektor, but I know they have a fanbase and MKX lacks proper cyborgs, so I wouldn't have been against either of these being included.