Arrow season 5 finale aired in the UK tonight, so I'm re-entering this thread, like Olly returning to civilisation after Lian Yu, albeit with less fake hair.
General thoughts about this year's shows:
Legends s2: last year the show was fun in a crap way. This year it was just fun. Shame they clearly have no idea what to do with Rip, as they were kind of obligated to use him. I really enjoyed their use of Reverse Flash, Damian and Malcolm as the big bads. Good recycling of characters, especially Eobard, who we didn't get see much of undisguised on Flash.
Supergirl s2: the move to Vancouver didn't really adversely affect this. I like their Superman well enough and really liked Mon-El. Winn's girlfriend was a bit crap. Original Hank calling himself Cyborg Superman made so little sense it was ridiculous. I'm all for Alex discovering her sexuality, but most of her stuff with Maggie was dull. The lack of Max Lord was a bit weird. Did he die last season and I forgot? I loved Cat instantly recognising Jimmy as Guardian. Snapper Carr is a passable character, but a misuse of the name. Kevin Sorbo and Teri Hatcher was fun stunt casting. Surprised they didn't wrangle a scene between Cain and Hatcher though. I figured the thing in the tease for next year was Eradicator, but I'm not that up on Super things.
Flash s3: yet another speedster big bad was made a bit more bearable by the reveal of his ID. All the stuff with Caitlyn this year was naff - yet another toxic love interest and then the ridiculous powers make her evil nonsense. I'd rather see more of Jesse than Wally as Kid Flash, but whatever. HR was pretty cool and I hope we get a fourth Wells next season. Tom Felton spent half the season being the blatantly obvious mid-boss and then half a season standing around saying "mate" as every other line. which seems a waste. Adding Anne Dudek to the cast is a good move for the future. The last few minutes of the finale were pretty stupid - why does the speed force prison always need an occupant? Why is Barry so calmly going into it as if he always knew he had to when minutes earlier he was delivering wedding invites? (and yeah, all the stuff about how they feed prisoners in STAR Labs is one of those threads you can't really pull or it all falls apart).
Arrow s5 - the flashback stuff was fine, but the way it tried to link back into season 1 was legitimately insulting. Fake hair and beard? I mean, ever since they cheated on the "five years on a desert island" schtick in season 3 with the terrible Hong Kong diversion, I knew it was going to be a cop out, but to so awkwardly reposition Olly into looking like a castaway was awful. Just fudge the dates (which weren't given anyway) have him miss the arranged boat and have to wait for another one and legitimately end up dishevelled. They call Lian Yu a desert island, but it had pretty heavy traffic, so it wouldn't be that implausible. All the stuff with Prometheus was ok (and a surprise reveal. I had stupidly decided to google Adrian Chase the week before, wondering if he was in the comics and saw he was Vigilante and thought I had ruined that surprise for myself, so him being Prometheus was a nice swerve), though got a bit repetitive near the end with "Where's my son!" I mean, Olly, come on, he's not going to tell you. Just secure him and go and look for him (like on the boat he clearly mentioned as he left Star City). I liked most of team this year, especially Ragman. (Ragman!). I guess he's the only sidekick next year, what with all the explosions. I really thought the season would end with Chase manipulating Oliver into revealing his identity.
Oh and the musical episode was a bit disappointing. I was hoping for something closer to the Brave and the Bold Music Meister episode, where everyone's made to sing, rather than a musical, pep talk dream world thing. I did love the Super-Friend song though.
Things I want to see next year: Resurrection Man! More Ragman. Impulse (they haven't introduced a new speedster onto Flash in like two weeks!). Really want to see Supergirl do the Metropolis Kid version of Superboy. And I hope Arrow continues flashbacks next year with clips from season 1.
EDIT: oh, nice to see Slade back too, though I thought his actor was in jail, for some reason.