Bookwyrm627: I'm with SirHandsome. How does it suck? It has all of the essential skills of the Knight, except it effectively swaps dual wielding for clerical magic.
Edit: For that matter, how does the Druid suck? It covers nearly all the Self and Elemental magic bases which matter in one character slot.
Stig79: It is due to the lack of being able to Grandmaster certain skills the sorcerer, Knight and Cleric can grandmaster in.
I'm going to assume you are comparing the Knight and Paladin, and you are comparing the Sorcerer/Cleric to the Druid.
The Paladin can GM all the important skills the Knight can GM (namely Repair Item). Paladins can still Master the Sword for dual wielding, but I expect they get a lot more mileage out of GM Mace for that chance to paralyze on hit. They trade in the Knight's dual wielding for Master Self magic, making them more defensive to the Knight's offense.
The Druid can't GM ID Item (Scholar underling solves that) or Merchant (gold eventually is very plentiful regardless). That just leaves spells. Sure, the Druid can't learn Light/Dark, instead getting Self + Elemental. They only really lose out on Invisibility (extended duration), Enchant Item (more powerful enchants), Town Portal (when monsters are close), Lloyd's Beacon, Protection From Magic (death/eradicate), Power Cure, and Resurrection (I guess).
Of those, Protection From Magic and Power Cure are the only ones that really matter.
I figure Paladins and Druids are both solid classes. Look at the Ranger for a class that sucks.