What's Wrong With HTC Sense?
There are a lot of people complaining about HTC Sense - how it delays the launch of Android updates and assists in the fragmentation of Android.
Sense does a fantastic job of giving HTC phones a consistent look and feel and a set of widgets that look like they were designed by the same team.
Those people who complain are probably the same ones who moan about Android phones having a less well interface the iOS or WP7.
Sense is a well designed and thought out UI which makes for a positive user experience and gives a consistent face to Android phones from HTC. The improvements in user experience over the life of the phone more than make up for any delays in delivering updates.