Looks like Robert Beltran has been voicing some complaints about his time on Voyager, but the biggest thing he complained about was the Prime Directive, calling it fascist crap:
http://www.cnet.com/news/star-trek-...-beltran-the-prime-directive-is-fascist-crap/
I think he has a valid point about the Prime Directive, in the TOS era it comes off as a reasonable idea that can applied differently based on the situation, by the TNG era it has transformed into a fanatical doctrine that cannot be challenged and Voyager was no exception to that. The TNG era PD often seems to make the Federation look elitist and lacking in empathy.