Unless I've made a serious mistake looking at the stats, no it is not. Comparing Cosmos II to staff Mega set and then talking about damage alone is unfair.
Change a piece or two into scubber/scraper. And the stats should make you think again. (and theoretically if you're all about hits then one mastemind, which I would not recommend). In any case, it is quite easy to combine a mixed pure int set for a 55 that deals waaay more damage with better armor and hit/crits than the cosmos II does. It's time is up, sorry.
I keep repeating this in many threads, but I can't get past it. Try as I might twidling with numbers in spread sheet and comparing those sets I cannot understand the fiftyfives I still see wielding the keeper staff for any other reason than it's cooler looks or nostalgy.
My guess is that this is what the devs wanted with the new gear (orange, greens and purps inclusive). They're very polarized in their stats allowing various cheap combinations that can be better for many uses, if not all, than simply the most expensive set might.
EDIT: and if by keeper's set you were referring to the keeper's shadow set (stick and doll) the same thing applies. Mostly mega gear with some scrubber (or even scraper) pieces yields overall better stats regardless of your preference.
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