Since a lot of my post have been about consistency I will keep moving in that direction.
Probably one of the biggest set backs I can see is the fact that when viewing your profile you have no Stream Filters other than your installed apps. This forces users to have to move to the dashboard to view their stream and filter with it. Groups and Events also have a better stream filter than that of users.
It would be my suggestion to add the Stream Filters to the users profile page as well. It may be that some users won't want this on their site so having a toggle to turn this on/off might also be a wise choice.
Here are both, side by side:
http://screencast.com/t/7Yodn2Qaba3
Thanks,
James