I agree a range of creature levels was a good thing about DAO - in fact DAO did a lot of good things.
It did indeed. If you do a bit of digging into the game's codes and all that, you get the feeling back then they still put a lot of thoughts and effort into their game(s), and into the right places.
A nice thing about Baldur's Gate 2 is that, it is harder than in most other games to be overleveled / overpowered. In BG2 the bigger emphasis is on what items and equipment you have available, and how you use them. In most cases your characters don't suddenly become much stronger
every level-up. Maybe except for clerics and sorcerers.