Calm down, necromancer. No one is saying that Tolkien's vision of hobbits is stupid. No one is saying that that were created to be useless extras in Tolkien's works. I like Lord of the Rings and The Hobbit. The issue is that Tolkien's vision has become inextricably intertwined with fantasy, especially role-playing fantasy. This has reduced what was originally a new and awesome idea to the level of cliches, and usually badly done cliches. That's the problem we have with hobbits. Plus, while hobbits were pretty cool in the original stuff, they've been reduced to exactly what everyone has said they are in role-playing and a lot of fantasy novels.
Plus, while I know that hobbits could, in theory be supposed to represent the better parts of human nature, the truth is , Tolkien's hobbits weren't all sweet and innocent and noble. There was Bilbo's relatives, who tried to appropriate Bag-End and eventually Bilbo's fortune. Gollum may have started off as a hobbit, but look where and what he ended up. Even Frodo had a darker side. And the hobbits weren't the only ones who were noble and stuff: all of the named characters had their noble sides unless they were expressly villians. And as for humans, elves, and dwarves "solving problems by killing left and right"... Well, when a horde of screaming, murderous orcs, goblins, and assorted other things is chasing you, there's not really a different response possible. Generally speaking, the Good Guys did not attack unless they were attacked first, or it was painfully obvious they were about to be attacked.
But the fact remains, in current fantasy and mainstream role-playing worlds, hobbits have become something of a joke.