You do you, but it's surprisingly good. It's not amazeballs the way Babylon 5 or the occasional Star Trek or Doctor Who episode is, but it's really solid.
I'd probably stop after season 8 though. That resolves most things, and then they introduce a new threat in season 9 that's just like the old one except more glowy and without the personal touch. You can really tell that they intended to have season 8 be the finale, but someone decided that they wanted more so they had to bolt on an additional season or two.