Anyone who doesn't choose Eva should be fed to cluster lizards.
Agreed. If I was shopping for a cluster lizard / love slave hybrid, no question that I'd pick Zev
But yes, Seeberg is fine as the different character Xev, and season 2 has some epic moments mixed in with the stupidity, especially near the end.
Season 3 could have been edited down to half its length without losing anything, it suffers from the vintage Dr. Who disease of pointless running around on the sets to pad out the time. I'd still say it's worthwhile for the good bits if you have the patience for the rest.
Season 4 ups the silliness and intentional stupidity even more, but sadly leaves out the nudity that was in season 3. Even if you can't take it after the first couple of episodes you should still watch the last few to see the series finale.