Come to think of it, why is Dwarf on the top? There are no classes in the game at all that go Wis/Con as both good for it except fighters, and that's two completely disparate builds.
As well, having a racial that's based on one of the attributes the class gives you is a feature, not a bug. Why does that cause Tiefling to plummet more than Dragonborn?
And if Drow are narrow for one class, and halfings are narrow for one single build of one class (Cha-Rogues), how does Half-elf get rated lower when they are good for -every- build of a single class, and have access to the best feat in the game?
Dwarves--Wisdom and Constitution are generally the most universal tertiary stats, as Con modifies HP and surges while Wisdom boasts the largest array of skills based on it. They do well with Barbarian, Cleric(+Wis, and Con isn't a waste), Fighter, Paladin(Con/Wis are both important), Ranger(Con/Wis is solid on a TWF), Warlock(Infernal who actually dumps Cha), Wizard(Staff/Orb), and even Swordmage(16Con, 18Int, 13 Wis). Artificers are also Con/Int. The only two classes they match up badly with are Rogue and Warlord, and even then its not horrendous. Also, its not just racial abilities, but also feats. Dwarven Weapon Training and Paragon Dwarven Durability are very good feats, not to mention FRPG's amazing Shield the Fallen.
Dragonborn vs. Tiefling--Charisma is a dumpstat for a lot of classes/builds, while Con is useful to important for most classes and is almost never dumped.
Drow and Halflings are more versatile then you think. Halflings are deceptively fantastic at the Warlock class, and are surprisingly solid Fighters, Rangers, Paladins, and Warlords. Drow, also specialized in Rogue, benefit from a stronger than normal feat selection, and do well at a lot of the same classes, though if I have misplaced any race on this list it would be Drow. Half Elves suffer due to Dilettante, which while supremely versatile, lacks the oomph of other races' powers, they don't really get anything else purely from their race, and while they have a great feat selection, have few classes they do extremely well.