BLM is easy to learn and tough to master. You have to really abandon the notion that it's a rotation strict class in order to excel. The best BLMs out there realize this and can stay on top of their mana consumption while moving and keeping their IIIs up.
It's more like a weave when done right and don't go falling into those silly guides that tell you there's only one/two ways to play your class. Those are there to guide yours first steps on 50 but are ultimately limiting if you put too much faith in them.
If you want something fun and exciting I'd go WAR. They group aggro very easily and if you don't blow all your tp away right away holding mobs is simple as an overpower to the face.
And for the record no class is "easier" than any other. It's all about personal playstyles. Experiment til you find something that interests you and you'll excel no matter what.