While Tempest have lost a lot of DPS since it came out - partly due to severe nerfs, and partly due to other melee classes getting powerful PrEs of their own - rangers and Tempest still have lots of pros. They are still quick vorpalers, they can get a nice AC, they multi-class very well (and deeper now after the Tempest III nerfs), as rangers their spell list is great, and they are in general very self-sufficient. Everything is not about DPS.