Absolutely. I love, LOVE taking the farm between the four city pieces. I love the idea of this tiny farm between these cities and it looks really nice on the tile. It's actually a weakness of mine, because I claim this farm too often (sometimes against my better judgement), just because I think it looks cool.
Thinking more sensibly about it, claiming this farm gives you a maximum of 12 points and obviously no one else can join your farm. If the tile is drawn early in the game, the possible 12 points in exchange for the loss of a meeple is probably not worth it. But if it comes later in the game but still with enough tiles left to complete some of the cities, it can be worth it (depending on the particular situation in that game, of course).