For a regular user, the primary thing you use your upload side for is sending web requests ("please show me this page:...") Sometimes you'd upload files like pictures or videos, but not often enough to "need" a really fast upload connection.
You'd need more upload speed if you were hosting a site. If you're just after BAD-@$$ speed(

), 2 up/15 down is "more than adequate.

My current DSL service gives me dependably 600k up and 5Mbps down, and it's pretty darn fast.