Jennasis ~
1. She never REALLY explained why Bella left Phoenix for Forks. The best I could gather is that she wanted her mom to be able to spend more time with her semi-pro ball-player fiance? That seems a little far-fetched a reason for a teen to leave a bustling Metropolis she loves for a town and a father she despised. I know, I know, it's just a book, but she would've found a more compelling or believable reason.
Personally I think this is all about showing us Bella's maturity level. She is willing to look past what SHE wants in order to make her mother happy.
It is said repeatedly throughout the books how Bella is more like the mother, always taking care of Renee. Renee even refers to her as an "old soul" at one point.
To me this is just one of the many things that makes her different and attractive to Edward from the very beginning..because she is just SO much different than the typical teen.
2. Her physical description of Bella bothered me. I could never get a clear image in my head of what she looked like (body type, height, facial features). To be honest I was also bothered by her insistence that Bella was clumsy. I know why she did it (vampires are so graceful and the juxtaposition and all) but it just annoyed me.
Hmmmm..can't really help you there. I guess my mind just kind of picked up the basics of her appearance..hair color and length..size..skin color..and then I just filled in the rest with imagination. Never really had an exact picture in my mind of what I thought Bella's face looked like. I do think Kristen Stewert is pretty accurate though.
The clumsiness didn't really bother me so much either. Maybe because I have a clutso DD myself..I'm used to it!

She's seems to be going through some sort of stage where she is constantly tripping over her own feet, dropping things..etc..
It kind of becomes a running joke throughout all the books, and adds a lot of humor IMHO...
especially when you get to the first chapter of Breaking Dawn!!
3. Again, it's just a book...I KNOW...but I HAD to wonder what the heck Bella and Edward do about their relationship during...ahem...THAT time of the month. Must be awkward!
Stephenie actually answered that question over on the Twilight Lexicon.
She says...
Several girls wanted to know if Edward would have a more difficult time being around Bella when she?s having her period. Answer: Yes, a little bit, but he would never say anything about it?much too much of a gentleman. And Bella would be way to embarrassed to ask. (It?s not the same as a cut, though. It?s sort of "dead" blood, if you get my meaning).
4. I get that the two of them are deeply, madly, truly in love, but it seemed almost verging on smothering.
I can see where you would feel like that, for ME personally though, that's what I actually liked about it.
It's just SO far from a typical romance. At one point it is even pointed out that he is like a drug to her..her brand of heroin.
They NEED each other..desire each other beyond all reason.
I like that it causes them actual physical pain to be separated from each other..if only for an afternoon! I guess I just love being swept away by the intensity of it all.
For me..it would only be smothering if either of them didn't feel the same..felt like the needed their own space. BUT, since they are equals as far as that goes..in my eyes it's not smothering.