The plot of "The Librarians" is so vague, it almost seems as if it was was created by a pair of hyperactive 9 year olds who were stuck in the library one day with nothing to do but let their imaginations run wild. "Oooh, and let's pretend the librarian has a magical sword that flies!" "Oooh Oooh and they have a secret portal to the minotaur castle!"
Even the level of character development seems like it was written by kids. The thief character has absolutely no development beyond being a thief who lives thieving. He also has a cockney accent which is as lazy a characterization as you can get (Rattling off awful action films that use this trope: "Mortal Kombat", "Fast and Furious", "LXG" and "Tomb Raider"). We also have an exotic looking bad girl with a British accent and an inexplicable willingness to hurl herself at the good guys expecting different results along with henchmen that come straight from the "Mighty Morphing Power Rangers" school of attack. It similarly takes a special lack of competence to put Rebecca Romaijn alongside someone like Noah Wyle and produce so little sexual chemistry.
If there's any fun to be had, it's watching pros like Jane Curtin and John Larroquette dive into such inanity as if it's Shakespeare. To the show's credit, it has some self-awareness of its cheeky nature, but there's no harm in actually making the show good on its own merits.
Chris Elliott finds his footing here as the kind of oddball sitcom character that would only exist in a quirky world like this. Maybe it's just me because I saw more Chris Elliott in the '90s than any other decade, but I would have trouble seeing Elliott in a comedy without that old-school quirkiness as opposed to something set in the present day. On the whole, it's still an entertaining show and I'd be on board for a second season.