But seriously, we got Zero for that, his hellborn and bloodlust trees shine in my eyes.
I did wonder about that when I learned what Krieg's basis was. We had a berzerker and a melee specialist already. Why not do something new instead of a hybrid? They did with Gaige and it worked out well.
The inherent problem with a hybrid is that people can't help but compare it to the others that do the same things. Even if Krieg were superb, he'd either still not be as good as Sal/Zero at their respective games or outclass them at it. Neither is a good result imo.