So now that you've had your hand with Cammy, how is she lyte?
I hear Cammy's been nerfed 
So I've had the 360 version since 2/12, and I've been playing for over 60 hours now. Probably around 70-80 if you factor in the game at friends' houses and on PS3 too. And I've used Cammy the vast majority of this time. There's no way that she has been "nerfed" or that she sucks; I saw a thread about that on SRK and I see that others in it agree. You can't say that when this is a new game engine and new stuff has been added...it might mean that OLD tactics may not work or be as effective, but there's now new ones. The game (or at least for the home version characters) is still too new to be able to make an assessment like that so quickly. Hell, even the arcade version character tier stuff is still changing. Now people are putting C. Viper and Akuma at the top with Gief and Sagat, and Ryu has moved down a notch. And if you are looking at the tier list in that SF4 guide, forget about it. How is the guy who wrote that going to have a tier list in place for a game that just came out? He can't; I'm guessing it's based on play time with a select group of people, and that's what they came up with, but there's a ton more people with access to the game now.
Anyway, Cammy rocks. She has insane priority on some of her specials, and a very useful air throw. SHOTO. KILLAH. The drawback with her that to really be effective, you need to stay CLOSE UP at all times, and this can be difficult against grapplers. When you're close though, you've got all kinds of options open to you.
Cammy is my main, and yeah I face the same problems against Zangief users with her. She isn't that great and I can use Ryu to greater success than her in almost any situation but I just like Cammy and her play style so much and the fact very few use her so I plan on keep sticking with her even if it means I won't win as much as I normally could.
Up until the last day or two, I was owning Giefs left and right with Cammy, but now I am finding that I am being grabbed out of what I thought were safe, well-timed cannon spikes and spiral arrows, so I'm unsure.
With Cammy, I find I have a very hard time against good Gief, Guile, M. Bison, and surprisingly E. Honda players. I faced a Honda last night that I know I would have destroyed with anyone else, but I couldn't get past his defense with Cammy. Need to work on it.
Cammy is pretty fun to play as. I'm trying to pick 'off' characters to use mainly and she's one of the ones I use. Fei Long, Vega, and Cammy 
I was thinking about Dhalsim just to whore his teleport, but wow, he fucking sucks now. He floats in the air and instead of using the teleport as an advantage, it's now a necessity.
Yeah, I enjoy using the less-popular or just lesser-used characters. Rose is another I want to learn better because I've faced someone using her just ONCE this entire time. I played one awesome Dhalsim player, but found I was able to own him badly with Abel just doing basic stuff. It seemed like there was nothing 'Sim could do against it.
Nerfed, Cammy? Her special moves have insane priority.
As for my picks. I've been playing as Guile almost exclusively in ranked matches, sometimes with some Sagat action in there. In player matches, it has been El Fuerte, C. Viper, Gouken, Sakura, and Boxer. C. Viper is awesome. I need to put some more time with her as her poking and pressure game are top notch.
C. Viper is SICK SICK SICK SICK. Haunts plays her so awesomely. Makes my jaw drop.

I need to play a good Guile so I can steal some tactics.
Paging Drohne!

It's because of his Guile that I got much better against Guile players in such a short time.