Well RIFT is more like LOTRO (and WAR in parts), rather then WoW (although people think they copied WoW too..)
I've played many a year in to all of the above games, including betas of many, and I'm excited about RIFT, for the reasons people play LOTRO and WAR when they came out. I think tried and true design is just fine - it's a formula that works. Add some of your own style, and all new content to explore.
Some of us are tired of the gravy train that is WoW, especially once your doing the same thing over and over, the same places, etc - new stuff is where it's at. Cata content held interst for a few weeks, but the railroaded/dumbed down design had it all finished pretty quickly, and were back in the rut pretty quick.
Some seek new worlds to explore, new class dynamics and skills to develop, new enemies and adventures - away from the WoW universe. If a new game manages to do this, without falling over in a technical / un-balanced mess - then bring it.
IMO the Rift beta is extremely polished, and is way better performing than recent beta MMO releases. It's obviously designed by MMO players who have added many little things that lots of others should have, or only mods normally achieve. And I'm impressed with the product - it's certainly not slapped together in any way - they deserve their credit, and hopeful pay day.
The closed-beta plays like the full game, the graphics are superb, and many beta players are leveling up toons like it's fun times on launch day - rather than testing out parts, chars, zones.. or any of that Korean grind.
MMO Ground breaking? No.
Another Conan? Hell No (beta was really bad).
Is Rift going to be a good polished MMO to explore until GW2 comes out? (if even this year at all?), YES!
If you played plenty of LOTRO (or even WAR), than try Rift you will like it.
(also subs are cheaper than WoW if pre-ordered)
Sign me up
