Well here's a little round-up. If you want to see the full reviews click on each link to go to the websites.
First up is EW.com who said
"Robert Pattinson looks like a man in the adaptation of Sara Gruen’s best-seller Water for Elephants, acting opposite Oscar winners Reese Witherspoon and Christoph Waltz."
AND
"The finest compliment you can give a trailer for an adaptation is that it makes you want to read the book. This one does it for me"
The LATimes says
"We like the langorous, moody tone, though it's nearly impossible to judge from the trailer if Pattinson has any acting skills beyond that longing gaze thing. It's also mildly difficult to believe the 34-year-old Witherspoon could truly be wooed by a young man a decade her junior,(Kate: I beg to differ!) but that's a conceit we think we'd be able to get over."
(Kate: I'm kind of shocked that this was written by a woman)