tl;dr, it's enjoyably terri-bad.
I'm sure this has been said too many times already, but this show is really bad. With a blatantly overpowered protagonist, the obvious harem, shameless fan service, and generic and bland settings and characters, it's a wonder people watch it at all. So, if it's so bad, why bother watching? Because it is bad.
I'm sure we're all familiar with Tommy Wiseau's