I dont think that level advancement is too fast, it seems to be just right for my group. Usualy we dont get alot of chances to play with many of us having loads of school work or jobs, or other things that make it hard to scedual gaming in. Also in 90% of our campaigns the group turns on each other before we make it to the good parts of the story. I admit, for many more dedicated players, the leveling may be a bit fast, but hey the rule books are always open to changes right? There isnt a D&D police thats going to break down your door for not using the exp table thats in the DMG. If you like the level rate, go with it, if not slow it down. My group however likes instant gratification and run straight for the NPC that is ment for when they are 10-15 levels higher, and usualy my NPC gets screwed sumhow and dies(grumble grumble)they level quite fast, and im fine with it cause it gives me chances to throw harder and stronger things at them, which is more fun for me. But like i said, if the leveling suits you, use it, if not, change it up.