It was a great season finale that sets things up nicely for season 2. I loved Coulson's disintegration of Garrett, it was definitely a Joss Whedon moment, but I will miss Bill Paxton being in the series. Patton Oswalt's twin was a bit of a surprise, but I am thinking he is actually a Life Model Decoy. The only problem with thinking that is in that case Eric was taken down way too easily by Ward, the LMDs have super strength, agility, etc., as well as a healing factor. I guess Eric could have been the original, and Billy an LMD, though.
I did kinda squeal at the Billy reveal, though - Patton Oswalt was a great addition to the cast, so it's good to see him again. I recall Eric saying saying that he played Call of Duty with his Brother, but they're a bit too similar... And yeah, it's kinda sad to see we won't have Paxton relaxing, flying a plane with his feet, reading a book, and listening to Don't Fear the Reaper again. Also glad to see Triplett as an apparently permanent member, and can't wait to see what happens with Fitz - like I said, he's my personal favorite character. I won't even bother to guess what's up with Skye-I'm a video game nerd, not a comic book nerd

but overall, I really like the season - with the exception of Ward's child abuse backstory, but I always hate those. They set things up pretty well, given what they had to work around, and I'd say that they started pulling things together around "The Bridge", and really hit their stride with the Hydra reveal.
So, next season, we have Skye's father, Raina, Quinn, Deathlok still running around, possibly Graviton, Coulson's ressurection still causing issues...and yet, I still loved the finale.
But ponder this. In the next year, on tv alone, we get Agents of SHIELD, Agent Carter, Arrow, Gotham, and Flash. And I'm not even counting cartoons anymore.