I'm only watching 4 shows this season, thoughts so far:
Erased (Boku Dake no Inai Machi): Strongest first episode of the four by far, great delivery and excellent voice actor for the MC. This show has the potential to be AotS if it doesn't screw up horribly.
Dagashi Kashi: This one's been getting a lot of hype and my friend wholeheartedly recommends it (he's read the manga) but the first episode was a little weak for my taste. Besides for the sugar cube + coffee joke, none of the gags were all that good, though I've heard it only gets better and better. Unless it's egregiously bad, I'll probably watch this until the end just because of the hype behind it, but it hasn't been too impressive so far. The OP is kick-ass, though, and gave me flashbacks to when Gekkan Shoujo Nozaki-Kun first came out.
Musaigen no Phantom World: Interesting premise, but the show is super generic so far after only one episode, and the limbo scene is already infamous online. I'm a bit disappointed at how much fanservice is in the show after Kyoani busted out a show like Hibike! last spring. Going to keep watching this one because it's Kyoani, but I'll drop it if it gets worse.
Koyomimonogatari: Not too much to say here. First episode was fairly boring, but it's 13 minutes and it's free extra Monogatari. I've never been a massive Monogatari fan in general, but Owari was excellent and Kizu should be available with English subs soon, so this is more or less something to tide me over.
Normally I'd be watching more shows than this in one season, but I have 50 episodes of Chihayafuru to get through so I'm taking it easy. I've also heard good things about Shouwa and about Dimension W, but neither sound particularly interesting to me and Shouwa is also very long.