fighters front loaded
First, a lot of people probably are voting the opposite or just plain random.
Second, fighters are *amazingly* front loaded because I get a buncha cool proficiencies in martial weapons and a nifty feat.
When I look to see if a class is front loaded I look at two things:
1) Do I want to take this at level 1, then abandon it forever?
Here I've got the Rogue, Paladin & Sorcerer topping the charts
2) Do I want to throw in a level of the class when my own class doesn't seem to be giving me enough kick for leveling?
Here I see the Ranger and Fighter being the best choices. All the sudden my wizard can wield a greatsword and gets a fighting feat to boot.
But now look at the cross section, can I take Ranger or Fighter at level 1 and abandon it forever for the same benefit? Very nearly. Factor in the 10 hit points and I'd say that's a win.
Would I take my 11th character level as my 1st sorcerer or rogue level? Probably not. I'd never be disabling traps, the +1D6 sneak is pathetic compared to the damage the other characters are dealing and 8 skill points just aren't going to make up the difference if I've been unskilled for 10 straight levels. Dabbling in sorcery seems equally pointless unless I'm already restricted from wearing armor.
So, the classes most likely to be abused by taking just 1 level for the front load are IMO:
Ranger
Fighter
Barbarian (kinda sneaks outta no-where but it gives many of the same bennies as fighter or ranger with a different flavor and some other coolness to go with it)
Rogue (for the wizard who wants to really spike some skills or the munchkin looking to meet pre-reqs)
Sorcerer (for the monk or barbarian)