Nifft
Penguin Herder
Any class can use Hellfire Blood, because Flaming weapons add their keyword to all attacks when you use their at-will power. This makes Tieflings competitive in nearly all classes, even those in which they don't have a stat bonus to the class's attack powers.Tieflings are often Warlocks and Wizards and can use their Hellfire Blood feat, which even includes the much desired +1 to attack bonus
Hellfire Blood is very strong.
Elves also get a phenomenally strong racial feat, which along with their racial encounter power means they too can compensate for the expected +5% miss chance of taking a class that is sub-optimal on its face. (This is why Elf Wizards are good.)
Halflings make surprisingly good Defenders, with their racial feat.
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Dwarves have a great Paragon racial feat. Humans have a decent one, and while it won't come up every fight, when you need it it's really good.
The Eladrin Paragon feat is kinda meh for half the situations when you'll gain its benefit. If you're teleporting into melee (e.g. to flank), it's great! If you're teleporting to safety to avoid trouble, it's kinda meh.
Cheers, -- N