I have no problems using Gmail on the default mail app or initially through Safari, when I set up a new Gmail account. I now have a bunch of email accounts routed through the default email app, including several Gmail ones.
I also haven't had problems using my Netflix account on iPad. I use the app to stream a lot. I use the website to add to my instant and DVD queues. The instant queue updates immediately, so I can stream to my Sony BluRay player right away. That's all in good working order. My Sony sucks at keeping a network connection, but that's a separate problem.