There have been no arena changes in almost a year. If you're falling, it is not because of Plarium.

Less and less pages with bots or let say " easy wins" 

Simply, confirmation bias. There hasn't been any change. You just are only observing the things you want to see.

most teams have arbiter and valkyrie, some two of them...... the missions are far to hard. I once was gold 4 and now I have this mission but it does NOT count - shit happens and the motivation is gone

Plarium want money then they should give something back, change the arena! I read and hear so many frustrated players but Plarium will NOT hear.

hahahahahahah they made the stupid dupe system in place of more important things

Edited for language by your friendly moderator. Lets keep cursing to a zero. 

Thank you. That is exactly what I am saying. AND the exact issue I am talking about. I know it isn't just me as even the top players in my clan are complaining.  There is a problem there.

Removing the 'matchmaking' algorithm would help, it's that which brings you ten teams with Arbiter, they won't explain why that's there and you can't just have ten random teams from your tier

Arena and Great hall should be moved to the end of the progress missions - folk can see all the missions the can complete after the one they can't because it's arena based

The tag-team-arena has such limits, classic arena not.

I think there has been a reduction in the number of easy teams. The ones we are told are definitely not bots -that all miraculously appeared at the same time with ludicrously bad teams.

That is my observation of G4 at least, id love to see screenshots of G1 etc to see what it is like now

It doesnt really affect me too much, if someone has a speed nuke team and is under level 80, then most of the time ill win the speed race but i noticed it took more matches after reset this week to get a nice buffer zone, beause i was hit myself at reset more.