Easily top 10 at the very least.
Really good mobility, really good footsies game, really good damage racking(between move damage and build-a-bear combos), solid recovery, good edgeguarding, etc. His only real flaws are his weight + size combination, CQC is....okay. Oh, and only okay-ish OoS options.
Abadango would not have won Pound 2016(as well as placing as well as he has since) if M2 was anywhere near what he was pre-1.1.3.
During the 1.1.3 patch, M2 was practically reworked as a character. Then, he gained even more stuff in 1.1.5.