My thoughts from first ep or so on ones that I didn't reject, with the note I am biased mostly toward interesting storyline :
Sidonia no Kishi - I liked this the most of the starter episodes by a long way - a lot of stuff going on, very much show not tell. Nice touches of humor that fit well in the show context, fascinating setting.
Gokukoku no Brynhildr - My pick for second place start - darker storyline and setting, the main character exhibits some actual curiosity and thought processes.
Mahouka Koukou no Rettousei - Seems interesting, the main guy's self doubt seems a little ludicrous though.
Captain Earth - If that's the most efficient plan they can come up with for launching a giant robot, it's no wonder they need a 15 year old to save them. Still watchable.
No Game No Life - This was pretty fun, have to wonder if God knew what he was getting himself into importing those two ;p
Hitsugi no Chaika - Interesting, definite potential here.
Black Bullet - Mixed feelings here - I thought it was going great up until the spider gets killed, then it immediately degenerated into pants on head retarded slapstick comedy. It was very jarring. Got a bit better toward the end of the episode.
Ryuugajou Nanana no Maizoukin - Potential, but didn't really grab me.
Akuma no Riddle - Lesbian assassins sounded more interesting than this one has turned out so far. Will give it a few more episodes.
Selector Infected WIXOSS - So-so, I will watch a few in the hope in turns into a spectacular train wreck like Madoka. ( There's some hope of that from the opening dream I guess - the impaled decaying monster bears a suspicious resemblance to Tama )
Seikoku no Dragonar - Seemed pretty mediocre overall - might pick up again if I hear good things.