Tabula Rasa is an amazingly addictive game that does things right the first time and sets in place some new concepts.
The leveling system is nice with a focus on completing quests rather then mindless grinding. The pvp system is existent but haven't had much experience with it. It has a dueling system that needs some work but has great potential. As for world pvp the only thing that comes close is clan vs clan wars. Assaulting and defending bases is something that you should definitely see in more games and is an amazing feature that makes you feel part of the ongoing war between the Bane and everyone else.
The cloning system is a nice touch and allows you to experience different tracks without leveling up a brand new character. The ability to change your armor color to something that better suits you is definitely something that allows for a good range of customization. The only thing really holding the game back is the considerable amount of bugs existent in the game. This can be remedied after a few months of patches however.
For those of you who are getting bored of your current mmo I would definitely suggest trying out Tabula Rasa. It's a game that in a few months I can see hitting up the top spots in the mmo charts. It's not a WoW killer..... yet, but it definitely has some great potential and amazing concepts that will keep it around for a long time.