First, Ignore Hoff he's been going off on every thread probably banned or something.
Overall it sounds ok, but a few criticisms-
1)Skills: Lose Bash, Stun, Rampage, and Attract and change backstab. Anything with even a remote chance of 1-shotting anyone or any boss would just be seen as unfair. Backstab i think should be more like baldur's gate backstab where it's like 400% damage attack except more damage as u put more points into it.
Also, you're missing the most basic principle skill a thief needs: Pick Pocket. Every theif has to start somewhere stealing money
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