LoT is wacky fun, deserve a watch
Flash is okay. Watch it for Ralph and maybe Thinker.
Arrow is a step down from last season, not as bad as Season 3 and 4 though. Watch the two Slade episode and be done.
Supergirl is okay. Nothing too good, nothing too bad. Watch it for the waifus
The crossover is pruddy gud, so watch that.
Black Lightning is great so far and deserve a watch.