Airports are nice, your biggest negative is that it only has 4 external ports. 1 for WAN (DSL or cable modem) and 3 for the rest of your network. If you have a few wired devices, you're more likely to add an extra switch to it. It also tends to be more expensive than competitors, mostly because of the Apple Tax. The Airport also doesn't lend it itself to running open source firmware, like some of the Linksys do.
Positives. If you own a lot of Apple gear, set up is a bit easier. The newest dual band versions are nice because you can run 2 simultaneous networks at 2.4GHz and 5GHz, including making one a 'guest' network and separating it from the rest of your network for security. If you have to run more than one router in the house, Apple's setup is a little easier to do.
