3-4 weapons over the course of the character's life is technically 3-4 feats-- though weapon proficiency as a feat has always been lackluster. It basically represents flexibility though, which is the same thing that can be said of the spellbook ability the wizard has. Dropping that and implement down to 1 feat (I had 1 weapon at .5 and a weapon category at 2, due to the same 3-4 estimate) and categorizing rogues as "half" a weapon proficiency rather than going based on individual weapons evened things out a bit for rogues. It dropped everyone down to around 21-23, with the new outliers being paladin, fighter, and cleric. (And cleric was only 24.5)
Fighters and paladins are still up at 29 and 33.5 respectively, and I'm not sure tweaking the numbers on the base abilities is going to change that much. Paladins and clerics did end up with the highest point values on their class abilities (7 in total). The armor, hit points, and healing surges were what really bumped up paladins and fighters, accounting for a difference of about 6. The paladin beats out the fighter in skills, implements, and defense bonus-- putting him up to average or superior in just about everything.
Adding MAD into the equation might change things around a bit--
- cleric powers (Str, Wis; secondary Cha), abilties (Wis, Cha (secondary))
- fighter powers (Str; secondary Con, Dex, Wis), abilities (Wis)
- paladin powers (Str, Cha; secondary Wis), abilities (Str, Cha, Wis)
- ranger powers (Str, Dex; secondary Wis), abilities ()
- rogue powers (Dex; secondary Str, Cha), abilities (Str, Cha)
- warlock powers (Con, Cha; secondary Int), abilities ()
- warlord powers (Str; secondary Cha, Int), abilities (Cha, Int)
- wizard powers (Int; minor secondary Wis), abilities (Wis, Con, Dex)
Looking at that, I don't think that it would smooth things out, but it does make a difference. While clerics and paladins definitely have some of the worst MAD in the game, warlocks and rangers are only moderately better. Wizards definitely have the least, with only a couple of powers even using their secondary stat, plus their abilities. In terms of ranking, I would probably go Cleric/Paladin (3), Ranger/Warlock (2), Fighter/Warlord/Rogue (1), and Wizard (0).