Just played HL with two guys who went chogall.
cho was rank 3, gall was rank 29. pretty good stuff.
Isn't that good? Wasn't there a post on reddit in the last few weeks that ranked all characters on their effectiveness as a carry? Basically, it compared the winrates of all the characters when the highest MMR player on a team is playing them. Cho was at the very top, and Gall was at the very bottom.
Aha, found it:
https://www.reddit.com/r/heroesofthestorm/comments/440xot/know_your_carries_statistically/