The first couple of weeks were a mix of frustration and happy amazement for me! I had problems with various apps, like web pages being impossibly small when they load. But, as has been said, the beauty of Android is that you can customize almost everything to your own personal taste. Once I got that in mind, and with a lot of great advice on these forum pages, things started to come together.
Battery life and usability will improve after a while, mainly because you don't need to spend as much time experimenting with apps and changing settings.
Recommend DolphinHD browser, after you click a link turn the phone to landscape and it behaves just like a desktop browser, very easy to use once you learn the features.