Let's talk about Diablo 2 before the expansion. I remember guides to "How to level to 99 in 7 days". There was even one to do so in 2 days, but it required a friend and a specific build and dedication, but yeah.Quote from PolleDKBesides that, it took quit a while longer to get to level 99, unlike getting to level 60 in Diablo 3.
Diablo 3's level flow is perfect. The 1-60 matches the Normal-Hell progression, with constant skill unlocking leads to a fun play through.
If you didn't like playing Normal-Hell, then what the hell are you expecting from Diablo?
We at least have Inferno. You may not like it, but it's not like it doesn't exist...