Sounds more difficult than NL. If you farm some solid gear and max AA for the xpac you are working on, you can definitely kill Vulak etc with your own 3 box team. As Deruvian said though, this is based around having a permanent Evasive Discipline running on your tanks. Without it, the entire tuning would change drastically needing far greater healing. The one thing NL has going for it is the tune from Classic - Luclin. (PoP could use some tweaks). You aren't going to walk all the content your first run through without help if you don't have the gear. There's definitely a healthy progression community, but once you have gear and AA you can damn near do anything yourself with your 3 box team aside from some PoP encounters. (ie: RZ, Coirnav, Rathe, PoTime Phase 4+)