I'm playing a Warforged Battlerage Vigor Fighter with a Bloodclaw Executioner's Axe. I'm good. Tracking the temporary hit points are pretty easy. Then again, I'm not an idiot. It's basic math. I'm also nowhere near indestructible. Against minions, sure, but we don't JUST fight minions.
In terms of power, I'm one of the better members of the party, but we're also a smaller group. I don't shine brighter than everyone else. Decent defense, slightly better offense. About what is to be expected.
I like Bloodclaw when I remember to use it. It's a point of damage to deal 3 damage. Sure, it gets bigger at higher levels, but it's not that crazy. It's also not the first weapon that I go to for all of my characters.
For the most part, I operate on the idea that everything they've made is decently balanced. It works for us. Rather than knee-jerk freak about something, allow it into the game if it's what the players want. If some things are just TOO crazy for your individual group, talk it over with them and make changes accordingly.
I'm with a good group. If I got with a different one, and the DM said, "I'm not allowing these things." I would probably discuss it. I hate hearing, "Well. I think it's broken." I disagree more often than not with those people.