Color me cynical, but the biggest issue that I had with the trait system while leveling my new alts was two-fold. 1) It was bloody annoying having to either drop loads of cash or go out hunting for things on alts when I got them to 80 and was gearing up to try out the build I wanted to...only to realize I was missing some of the traits that I needed. That part was more of an annoyance than anything else. 2) The areas and things that were required to unlock certain traits never seemed to line up with the levels that I unlocked that tier of traits. As a side anecdote that's related, I had gotten two of my buddies into the game right around the same time that the trait system change and NPE came down the pike, and the question that they continually asked me, esp when they unlocked their Adept trait tier, was "How am I supposed to finish this event chain that is x number of levels above me, so I can unlock this trait that I just got access to? If I can't do it yet, why did I just unlock the trait? That makes no sense." Or something to that effect.
I liked the IDEA of the trait unlock system. But the implementation of it fell short of what it could have been. Much like a lot of the content that Anet has released recently.