3e has the option of creating new prestige classes. Can you guess where this is going?
But, there is a significant difference. PrC's are entirely the responsibility of the DM. There's absolutely nothing about PrC's in the PHB. Priests were called out in the PHB, meaning that players might actually think that they are for playing.
Take another example then of how poor rules + poor dming can destroy a game.
In 1e, if my fighter in plate mail wants to jump a 10 foot pit, there are no rules. A good DM will think, "Ok, 18 Str, and I want to get on with the adventure" and say, "Make a Str check at -4". Not too difficult for the player and keeps things moving.
A bad DM might say, "No, you cannot jump in plate mail. Spend the next hour trying to fumbly your way past this trap. Hahahaha."
In 2e, by the rules, unless I had the jump NWP, I shouldn't be able to jump at all. So, the bad DM does the same thing and forces the players to fumble about coming up with ways to bypass something that should take 23 seconds.
In 3e, the player looks on his character sheet, notes his jump check modified by armor and whatnot, looks at the PHB for the DC and rolls. The DM isn't even involved.
I think that, right there, is what people object to. The fact that as a player, I can resolve an action without any input from the DM. In earlier editions, there were practically no actions I could take without input from the DM, which placed the DM very squarely on the top of the pyramid. There was nothing I could do without his express permission. 3e allows me as a player to perform a fairly large number of acts, without any input from the DM.
And I think this scares DM's.