Ranger

Rangers are usually nature loving fellas, wielding either a bow or two swords. They are competent fighters that are generally useful for tracking down enemies. They also are shitty divine magic users for those who don't have the balls to play a cleric or a druid. It is worth noting that one of the defining features of rangers is that they specialize in hunting down and killing members of specific races. From a pragmatic standpoint, this means they boil down to little more than racist serial killers who target by species. Being that race wars are one of the cornerstones of D&D, this is unsurprising. They are rendered irrelevant by druidzillas, because rangers just can't compete with a guy who can turn into a giant bear who shoots giant bears out of his eyes while farting lightning and mauling things with his overpowered pet grizzly bear. Rangers can get a half-assed pet grizzly bear, but because their animal companions are only as good as a druid that has half as many levels as he does, it's half assed.

In 4e they get to mark their enemies, making them useful when you're fighting one tough thing and a bit crap against swarms. They can either rape one enemy, or irritate several, depending on what the situation calls for.