Adding half level to all attacks encourages multi-attack things (cue the Ranger) more than others, and reducing defenses by so much means that it's trivial to "stun lock" and otherwise apply rampant conditions to monsters.
I do like the idea of adding half your level to damage to attacks, just not to _every_ attack.
In other news, in our game last night, the only complaints were about people killing things too fast. Just when I was thinking of reducing hp myself, I'm having to stop.