So I am Team Level 60 on Server 15 which caps on Team Level 80 currently. Here is what I think the current tier list for my server is like. This is obviously my opinion and I really looking for feedback from all you guys. Most of what I say is however influenced by the top players in my server and their builds. This is also mainly focusing on Arena and Coliseum. The order of their placement in the tier matters, but not a lot. There are a total of 41 heroes.
S tier :
Sulley and Boo