Initially, I wasn't too pleased with 3E. I had a lot of 2E rules books and knew the system back to font and front to back. I still bought all the 3E stuff when it came out, but I was slow to absorb it.
That lasted about six months, then, as the song goes "I've seen the difference, and its getting better all the time".
I've since found 3E to be great (as compared to 2E, the only other RPG system I really used). Multiclassing is so much easier, monsters can be given class levels easier, and even played as characters with little problem. There are explanations for things like arcane spellcasters wielding spells. Its easy to run a modern-day campaign, and best of all, so many companies are making new products that we have a wide variety to choose from. I doubt I'll ever get tired of 3E.