Beru has said something that I was thinking just the other day - Firelands may have taken the challenge out of an encounter but that doesn't mean that it can take the challenge out for YOU. Set your own challenges. I was thinking of going DPS for Firelands (though my gear level won't let me in - LOL or perhaps my skill level!) or even trying to 1 or 2 heal an encounter just for kicks. Just to make my life interesting. Of course, we haven't done heroics yet (not like Beru who got to heroic Rag in 2 hours) so we are on a different page, but I guess my challenge next will be getting these heroics down.
I like seeing what other people think of tier sets. And I really like how Vid likened it to Heimdall in Thor (since I really liked the movie!). Which reminds me that I should add the Paladin Tier set to my other post so I can make some comments on it. Which will now pale in comparison to anything that Vid has said!