I'm with Udie. I liked Episode I even when I found some things wich could be better in it.
I've liked the episode 2 trailer, too. We all know there is going to be a love story behind the reasons why Skywalker falls into the Dark side, and that the love story will probably mean something between Amidala, Kenobi and Skywalker. So, why are you surprised to see that part in the trailer?...
About the actors, I like Ewan McGregor as Obi-Wan Kenobi,and I simply LOVE Natalie Portman (so I'm not objective about her role as Amidala

). The new guy -I don't know him, so I can't say. But I'm sure Lucas will have chosen well.
If filming a love story is to make a "Chick movie" then "the Empire Strikes Back" and "The return of the Jedi" are also "Chick movies", for their romantic content was also quite high, and also involved two men behind the same woman

.
This trailer could be better, but its OK. It gets me started and makes me want more. So it does what its supposed to do.

I'm sure there is one BIG surprise behind the prequels. I have heard and read some rumours and if they are true...well...
