i can get my toon The Sharkness with LR at lvl 8 has a dex of 62 and a dodge and avoid of 55.% and keeps going down every lvl

Wait, are you saying he sucks he doesn't suck? Kinda confused by that? You mean he keeps going down as in dieing? Every level, do you mean like every fight or what do you mean by every level? :/

He meant that every level his avoidance % goes down due to the diminishing returns on stat bonuses.

Let's say you have 50 dex and 50% crit chance at lvl 10. Without getting new +dex gear and +dex talents that 50% will gradually go down every level.

That's why it can really hurt your avoidance/crit chance in later levels if you don't manage to find gear with powerful enough stats.

In theory you can have almost a 90% chance in both IF you use Masterful Dodge. Alone your top % will be closer to 70-80% in each.