I'm not much of a "Hercules" fan, but that's mostly because I haven't had many opportunities to see it. I saw a few episodes as a kid and liked them, but I haven't had access to a channel that repeated them and couldn't be bothered to go back and re-visit the series on DVD. I remember liking a lot of the supporting characters like Aphordite and Ares more than the two main characters (although I liked them too), so I'm glad they appeared so much on "Xena" so I could see them again without watching "Hercules".
I just revisited the Xena series for the first time since childhood recently and I think this just may be the most inconsistent show I've ever seen. So many of the episodes are so gratingly melodramatic that they infuriate me, while almost as many infuriate me with how over-the-top slapstick they are. On the other hand, there are episodes that hit that sweet spot where they're slapstick or straight drama but just subtle enough to not be excessive in either direction so they end up absolutely sublime. When the show does slapstick or drama without going too extreme with either, it does both with more cleverness, creativity, and real emotional depth and impact than almost any show I've ever seen.
When it fails, it fails huge, though. For example: Too silly or corny - "The Bitter Suite", "A Good Day", "Married with Fishsticks", "Endgame", "Motherhood", "A Friend in Need".
The problem with a lot of those is how convoluted the story arcs get and how ridiculous all the supernatural stuff is, with resurrections, life after death, etc. I think the whole series would have been better off if they hadn't bothered with all the absurdity of Gabrielle and Xena having evil spawn. The worst offender is "A Friend in Need" which I now think about the way many people think about "These Are the Voyages..." on Enterprise. "Soul Posession", the penultimate episode of the series, would have been a perfect series finale. Instead, it was followed by a painfully overwrought and overambitious two parter that was boring as hell, full of terrible characters, ignored the wonderful cast of supporting characters, and ended the series on a disappointingly lame, uninspired, and unnecessarily dour note.
Some of the arcs are great, though, like Caesar's rivalry with Xena, Ares and Aphrodite losing their powers, and the gradual (sort of) reform of Autolycus, who is my favourite supporting character. Other than the dull episode where they're trapped on a boat, you can be sure any episode featuring Autolycus is going to be fantastic. This is a show that I love if I can just watch selected episodes from every season, but I don't know how anyone can watch it all the way through and not go crazy over the inconsistency.
Some of my favourite episodes in no order (relatively subtle drama, pitch-perfect comedy): "Warrior...Princess...Tramp?" (Meg rules!), "Destiny/The Quest", "Been There, Done That" (following in the grand tradition of "Buffy the Vampire Slayer", "The X-Files", AND TNG with a thoroughly entertaining episode about things repeating over and over again), "The King of Assassins", "The Quill is Mightier...", "Forgiven", "A Tale of Two Muses", "The Ides of March", "Old Ares Had a Farm", and the delightfully meta "You Are There".