lol, I agree with Ray and Vital
At different levels of skill, one can be the easiest or the hardest.
Shiek for example in SSBM, is VERY VERY noob friendly. REALLY easy to pick up. So noobs who play shiek will dominate other players of same skill who don't play shiek.
But once you get to high level fox's marth's Peaches' Puffs. Shiek is one of the hardest characters to play because everything has to be precise.
Noob level = Shiek seems way too easy.
Advanced level = All the characters are hard to play.
Same goes for MK9.
I'd say Noob Saibot seems super noob friendly, but at high level the choices you make and the baits you need to do. It's alot harder to play Noob at a high level than it is at a noob level.