ogre said:
Well, I guess there is a point there, that now you can run a dwarf sorceror or some other combo without starting off nerfed. But won't that just transition into 'why play a suboptimal dwarf cleric (assuming no Wis bonus) when I can play an elf cleric with a +2 Wis?'
Like Doug said, it's all relative. The +2 bonus becomes the standard, instead of a +0. So instead of being pigeon holed into not playing a race/class combo due to the penalty, you'll be pigeon holed into playing one due to the bonus. (assuming your optimizing)
Besides, the whole point of having a bonus is to set something apart from the norm (aka human). If everyone gets a bonus, what's the point?
You have a good point in that the elf's ability bonuses say "play a ranger to be optimal." However, ranger's have always been dependent on multiple attributes. If we consider the four classes that traditionally have one primary attribute -- rogue, wizard, cleric and fighter -- then having only +2 bonuses and no negative bonuses will make more combinations reasonable.
A elf probably will be a better rogue than a dwarf, and probably a better cleric than a halfling, but the difference would only be +2 with respect to any race and not +4 as it could be with -2 and +2 allowed.
For classes that be depend on multiple attributes, there would be a +4 difference between the best race for a class and the worst races, but it would be split between 2 attributes, rather than just one.
Another possibility is that the focus on single attributes for particular classes might be diluted; Bo9S had warblades caring about intelligence, PHB2 had fighter feats where wisdom mattered, and races and classes mentions intelligent rogues, sneaky rogues, athletic rogues and charismatic rogus.
So having pairs of bonuses might slant particular races towards either classes where both attributes matter (rangers for elfs) or particular styles of other classes (not that I can think of a rogue for whom wis matters, but perhaps a dexterous, even lighter armored cleric.