The villains on Gotham seem especially strong to me. I think they've done a good job with the casting all around.
Sometimes the show feels slow but for me I think that's part of the overall 'suffocating' feeling of the way the city is portrayed...strangled by the villains with so few to fight back.
(right now I want to slap Bruce out of his teenage angstiness...which I guess means the actor is doing an awesome job lol)

I still watch Arrow...but they need to find a way to get Oliver back in the suit and stop with so much of the other behind the scenes drama I think.
Haven't watched any of Flash and Supergirl (except crossover episodes) but I do like Legends...which always seems to me is meant not to be taken quite as seriously ;)

The brightest spot for me on Legend's mid-season finale was the appearance of Constantine ;) I would love him to join the crew for awhile (given they're now a few people short :( ) but I don't see that happening, unfortunately. He'd be the perfect weapon against Darhke (sp?) though.

oh yeah...I refuse to miss any chance they bring Constantine back.
An explanation for Darhk would be nice...as I thought he was dead, and then he's not...and now I'm confused ;)

I'm hoping they'll have to break Rip out of jail too...he needed knocked down a few pegs, but should come back. As long as he can TRY to accept Sarah as being in charge now...or learn to work with her.