Mmmm, well...
His best feats generally involve merging with super tech (Planet in Trial of Superman, Source Wall, Apokolips tech) or ambushing someone (Eradicator)
Straight up, I can't think of too many impressive feats. I mean, he lost in a straight up fight against Eradicator, and then got shattered into a million pieces by a newly restored Superman.
When it comes to energy blasts and tech adaption, he's top tier. Physically, he's more akin to Martian Manhunter..