I thought I'd join the rest of my LS and chime in.
Speaking from personal preference, if there are other DD's available (SAM, DRK, RNG, THF, WAR, MNK) I would choose them over DRG. DRG have really terrible weaponskills compared to other melee's. DRG's are just not flexible, and that's their major drawback in my book. The higher up you go, the more important skillchains become. You really don't want a DRG closing a skillchain, because their WS's are so weak in comparison. Therefore, you have to find another melee that does nice dmg that can close a skillchain. From what I've seen, the best combo to use with DRG is THF. Skewer > Dancing Edge is a good skillchain for distortion, and the THF can SATA off DRG. Other than that, DRG just doesn't play well with others. Like was said earlier, it's not their fault, it's the way S-E gimped them. Nobody is saying to stop playing DRG either though. If you enjoy playing it, and are willing to put up with the lack of invites, then continue playing it. But don't expect others to choose you over more viable choices when they're available. People want to get as much xp as fast and as efficiently as possible, and DRG just really isn't capable of providing that.