Chris, it doesn't suck and it may actually rock...
No, really, it depends on what you are looking for. Yamaha is a reliable receiver and it has a lot of features. The 5560 has a few more features than the 5550. Are those extra features what you want and are willing to pay extra for?
On the other hand, you could be looking at the Denon 1803 or Harmon Kardon or Marantz or.....