I have all the classes leveled and most of them are really enjoyable to play. I'll admit, Ranger is one of my least played classes. I think Mirage Mesmer is currently the most rewarding play-style once you get the hang of it. Dragon Hunter Guardian is the easiest spec atm (imho).

My wife (who doesn't play all that much) loves her ranger. I highly recommend ranger as a starting profession if its someone first time playing.