Speaking as someone who really enjoyed DOS2, I do have plenty of issues with its mechanics, with the movement ability problem you mention right in the thick of it.
Once you learn the game systems a bit, you will always gravitate towards a similar set of skills. Mobility is so important in the game that you will frequently find yourself in situations where your character’s survival depends on it (and the AI abuses these skills constantly). So everyone gets a jump skill, two if it fits the build - and many of the jump skills are just teleports with rider effects, so everyone’s teleporting around. All builds tend to gravitate towards more damage, because you can’t apply CC without nuking their armour down first, and CC trivialises fights when it comes into play. Optimisation isn’t straightforward, and skills aren’t really on an equal footing. Maximising Warfare is how you become the best Necromancer, and the best Rogue, and the best Warrior, and the best Archer. Meanwhile, all the other skills (with the notable exception of Summoning) you can generally just leave between 2-5 to unlock their respective abilities, regardless of your build.
The ultimate end-game of this is that loads of characters end up feeling very similar, even if they appear to do very different things on the surface. Once you get past much of Act 2 there’s very little variation in how you play the game and approach combat, and the story becomes the main driver for completion even as the core gameplay loop stagnates. I think I completed the game on my fourth attempt, but that was largely through my stubbornness rather than other factors.