Welcome! Not sure about "rankings", but I can tell you the Outback is a very popular line. I've known and talked to lots of people over the years who own them and most all are very happy with them. Like all of them, they all have problems, some more than others. As for where it stacks up in the Keystone lineup, I'd say about middle of the roadish. Enjoy your "new" rig and have fun!
2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)