From an experience perspective, and this is true in many genres - not just gaming - it is likely less important to him that he gets hurt less over time (as there are other ways to mitigate or repair from that), but more that he has something he can do when he DOES get hurt.
For his situation, the cost is 2 feats. PA, Cleave, Great Cleave, Toughness, Improved Crit, THF, ITHF, GTHF, Quicken sounds like a feat-set that's all kind of smashy, plus can pop a quickened cure. He'd lose the THF feats first, I'd suspect. His only benefit would be being able to pop a lock now and then, since I'm sure he wouldn't want to be doing traps.