Eh, the over world may have been done elsewhere, but XB1''s is still very good. I mean it still feels expansive enough to not feel cheap and the scale and wonder of it being on big giant robot gods hasn't been matched. I also think Xb2's battle system is a downgrade. It feels slower, overly complicated, and has a stupid gotcha system tied to it. While XB1 is a pretty simple to grasp tank, dps, healer system that really works, feels well paced, has'nt really been followed up on, and allows for some deeper playing around if you want to.
Xenoblade 1 is a real classic.