This is a bumped up old topic but still pretty relevant.
For me, a lot of the problem was worrying about EXP/retiring in general. Retiring to level 1 and leveling to level 20+ is a pretty horrible experience. After the market came out, I was like screw that. I am having much more fun with my gen 3 character. He is level 33 (respec'd at level 33 before). Don't have to worry about EXP, multiplier, or anything like that. I get on, play, and get off when I feel like it, even at X5. I found that much more enjoyable. I only have 1 loomed weapon but it doesn't even matter in the long run.
Classes aren't that out of balance, but I feel that improvements are still possible, such as the fixing of exploits and the tweaking of annoying gameplay mechanics.
All I ask is for devs to continue to take into account the enjoyment of their player base when making design decisions.