Poor map design, poor rewards, weak matchmaking, boring modes, and lack of class balance. Yeah, I would say that PvP definitely has some problems. A lot of it could be solved by better map design. The current maps are mostly the same and favor the same old dead play style since D2 lumbered into our lives. Shotgun rushing and hand cannons. The Crucible just lacks variety in this area. It's by design, of course, to make it easier on Bungie's devs for "balancing" weapons.