Top 5 Worst PC Prestige Classes

So one of the things that I always find amusing is looking through some of the fluff books that Wizards publishes and look at the different new prestige classes they put out.  And invariably, one of the things that always comes around is that some of them, while good for say...NPC's, are absolutely rubbish for player characters.  Seriously, these are horrible to use for your character as a player.  So, here we are 5 of the worst prestige classes from the Complete and DMG's.