Give half elves some sort of withering resistance based upon the strange mix of their lineages

[The Beggar]

I just played one, they're not that bad.

Besides, adding extra bonuses goes against elf-dom, which imparts half it's pansy-ness in cases of half-elves.

[el groso]

Strongsoul feat and more EFUSS points, IMO.

[Numos]

They may be a little underpowered, but I personally think half-elves should be a bit of a rarity. Having parents, friends, and relatives who live to be 70 or 700 - and living to 150-200 yourself should put you in kind of an awkward place.

That being said... I do know that in 3.5e they gave half-elves a +2 bonus to social skills because of cross-cultural competency or something. Maybe that might be an option? If anything is to be changed.