If something does not manage to match your expectations it is underwhelming. That is a pretty simple definition. I was with the EA from the start, I was one of those, who pointed out, that the first attribute system was even more horrible than the current system. I witnesses many changes during the EA, some for the good, some for the bed. But even after the release, the game just feels half baked, like they had many good ideas but no real concept to achieve them.
Sure, I understand, why they did some changes, but the core issue seems to be, they just wanted to change to much for being able to do it properly. That is way in many expects it feels worse than the first and not like an improvement. And some stuff that was already bad in the first game like inventory management remained pretty untouched.
So yes, it is unverwhelming for me. Perhaps not for most people, but most people are pretty easily satisfiable.