Massively^™

i like it, blizzard is finally taking the game in a direction ive wanted it to for a long time, by adding goals to the game that arn't about gathering as many people as possible as many nights a week as possible to get the best lewtz possible. i loved this whole idea in lotro, and hope thats wows version can be every bit as fun, challenging and rewarding.

Seriously, if they keep adding stuff I may have to buy them twice.

Well.. probably never. Levels and that type of gameplay attracts the "Achiever" archetype gamer, which is probably (just a generalization) the largest archetype group in entire gaming industry.
So business-wise implementing this type of system is great. It's also great for players who are into "collecting points", especially if you can show how many points you've collected in public (also called "flashing your epeen").
Slight critizism might be the utter lack of originality of this - Xbox Live and other places have had this type of achievement for a long time already. But then this is Blizzard, originality has never been their strong point - I'm sure they'll make a fine implementation out of this.