It's more interesting because it's more difficult, plus you're max level so your skills are completely fleshed out and you have more options in how to tackle things.
Are you arguing for the classes to be MORE homogeneous now? Maybe Gaige can't reload as fast and has to make the mags smaller and easier to handle because she's a teenage girl, not a veteran soldier like Axton? Think about what you're saying, man... These are RPG elements we're talking about here.