Started a ranger the other day on Arcanis (PVE). Only up to L13 so far. Going with a 51/15/0 R/NB/Sin build plan to start with and see how it goes. Its suppose to be the most popular ranger build currently. I keep hearing how the marksman (MM) is not good enough right now but that is heavily debated in the forums. So I decided to try it and get a feel for it and the game. So far I'm liking it. Hopefully the MM will get the boost they need to compete better.
Last night the rifts and invasions were going constant and heavy. I like the idea of Rifts and how they work. Its a nice change in a MMO. I'm curious though if the rifts open up as much as they do like last night because if so I can see where you could spend your whole time doing nothing but fighting rift invasions.
I still have a lot to learn yet. Its been years since I played any MMO and been out of the loop so its kinda like starting over again in a sense. A newb reborn. Heh, heh.
There is a world event going on at the moment which is why there are so many rifts and invasions popping up. There are three or four daily quests you can pick up from Sanctum (assuming you are a Guardian rather than a Defiant) for this world event.
If you are still levelling I really wouldn't worry too much about what build you take.