Trackers are used to track users data down & show ads.
Since Opera becomes a ad publishing company, Opera force users to see annoying ads. User's can't opt out from it.
They may say, Ads are the only way to income. But at least they should give users control over it. While previous version of Opera Mini, any user can turn off ads but while on latest (like version 31) It can't be turned off.
I have similar problems 1) 2) 3) 4) and 5). I use last version of Opera Mini for iOS with "Opera Mini" mode of traffic compression.
First problem ("pressing on a link takes me to the wrong page") I also had for Opera Mini for Symbian when I used Nokia smatphone two year ago. Nothing changes.