I'm annoyed by the fact that most achievements aren't really account wide at all. The whole feature is great for proving to random people "look, I did this shit, I got the xp" when you're on your alt looking for a group, but the main thing that has me interested in achievements are the points.
This is why I find it really annoying that the guild roster only counts the achievements earned on that specific character. In my opinion it ruins the rivalry in the guild because often the amount of points on the guild roster vastly differ from the points earned in your actual achievements tab. It also adds pressure to keep everything focussed on one character, which is exactly what Blizzard wanted to get rid off with the whole account wide thing.
Whenever I play my alts, I actively try not to get any achievements that I still miss on my main because I know I'll have to do them all over again to really count for me.
Am I the only one with this issue? Do you think the guild roster should just show your points as they are in your achievements tab? Should everything be account level?