Okay I've watched most of them now, so I'll give my opinions!
Guin Saga - Good first ep! I want to know what happens next.. yet given this is based on 125+ vols of novels.. I guess it's doomed to a horrible anime ending from the start.
FMA - going to watch still, seems like we're in for a lot of recapping of the original series for the coming episodes though ;( (necessary but still..
)
K-ON! - great! not as great as some overly excited people are raving, but still great!
Shangri-la - not watched yet.
Shin Mazinger - first episode is a must see. the current holder of title for "worst first episode in the history of ever!" aside from that.. I highly doubt I'll continue this one
(I assume this first episode was a summary of the last 20 episodes of the original mazinger..)
Senjou no Valkyria - Pretty interesting, main guy is amusing, main girl has cute expressions, plot is okay~ I shall continue!
Basquash - surprisingly good, much more than I expected, definitely on my watch list!
Cross Game - Got through surprisingly much of the manga in episode 1 (was expecting it to take 2 episodes) was well done imo and since I like the manga I'll keep watching it.
Natsu no Arashi - pretty sure I'm dropping this, not funny or interesting or anything really.
Saki - The "dramatic" mahjong is so bad it's funny, there's yuri moe! it's great for all the wrong reasons! I'm going to keep watching it x<
Arad Senki - Ep1 was decent enough, interactions between the main sword guy and the gun guy (I rock with names) was funny, though can imagine it growing annoying quite fast.. probably I'll continue
Queens Blade - Yay fanservice! They fooled me though, there was no tentacle rape in episode 2.. it was actually a very long tongue!
Asura Cryin' - Quite fun so far! may get bad once actual mecha combat starts to happen, which they've avoided for now.. A-KU-MA! indeed
Tayutama - mmm, ep1 was okay~~~ but nothing special really.. I'll give it one more ep to hit me with some great fanservice or this may be shelved ;(
Hatsukoi Gentei - Never really liked this first story in the manga that much, it was okay though, prefer the characters who become the focus later on, so I'll keep watching for that...
Also watching DBZ for the heck of it x< I've actually only ever seen it dubbed before, only have seen a few clips of the original japanese voices and feeling they were vastly superior. So will watch it now to see if it's true!1 or something... some one stop me.. I need help..
Oh and, I dropped Hayate the Combat Butler in season 1 pretty early on as it was just random and worse than the manga ;( But now series 2 by the new studio is following the anime well and funny, so I have to watch that too :/ Also, the ED is just pure hinagiku love. H-I-N-A Hingiku HAI HAI! How can you not love it?!
So yeah, I knocked only 2 of them off my watch list :E still way too many lol. I'm also still watching Sora Kakeru Shoujo and Chrome Shelled Regios from last season (26 ep serieses). SoraKake is just great fun when it's not being too serious, Lelouche's.. erm sorry, Jun Fukuyama's role is just so perfect for him it's scary. Always a great time when he gets to go wild. Chrome Shelled Regios, I, like everyone, ever, am watching due to Felli, who is just awesome <3 rest of the show is pretty pants tbh, but angry loli kicking stuff is just brilliant!
In other news, Miura Kentaro is taking a break from playing IdolMaster (I am not joking ><) to continue writing Berserk next month! Hurray! Bout time ><