I thought Kessel and Correlia were cool, and we didn’t see much of Mimban but for what we did it worked.
Only ones that are indeed “repetitive” are the snow planet and desert planet, but there’s gotta be a lot of deserts out there. It’s a planet of no interest, that happens to be by Kessel and is suddenly a battleground.
As for the snow planet they go for this Himalayan style that sets it apart from Hoth.