I did WAR as my main class up to level 50, then switched to BLM because I really didn't like being the tank. It isn't that I couldn't do it, but rather I didn't have any fun. My biggest problem with tank is that everyone expects me to be the leader and know where to go and what to do as tank. I also need to constantly keep hate on mobs, which is difficult.
Back in 1.0 we had gear that improved enmity on mobs and ways for tanks to gain more hate. Now I feel I have to constantly flash and provoke or it is very easy for a mob to get away, start attacking healer, then I have to focus on getting hate form that mob, only to have the original mob lose hate and go for healer. It's a juggling act I just hate having to always deal with.
Meanwhile party is getting mad because I don't keep hate. Would be nice if there were better ways to use abilities to gain hate, such as provoke being off a cooldown or have it provide more than just temporary hate.