Hi all, It is my first post!
Anyway I play for fun, so I do play all tiers and all classes, however I feel 5 to 8 for Random is the most suitable for me, I do play 9 and 10 occasionally. I still remember when tier 4 was the most balanced and most played. Good old Days.. As for PvE I tend to play 7 to 10 only nowadays if any. My favorite Tank is the Stingray...
Cheers!