My Issues with Opera Mobile:
navigating between links is a pain. On Mini, you can just hit left or right to page up and down, then hit up or down to move between links. And if you hold down the down button, it scrolls quickly between the links.
On Mobile, if you hold down the down button, it pages down the page, but not the links. If you have a link you want to hit at the bottom of the page, you have to hit the down button manually a bunch of times to get to the link. (you can't just hold it down).
There doesn't seem to be as many shortcuts. On mini I used #0 a lot to refresh the page. Mobile doesn't seem to have a shortcut for that (or at least, I haven't figured it out yet).