So I downloaded Fat Princess tonight and gave it a whirl, and it had its pros and cons.
Overall I'd say it was enjoyable to play, especially since Josh and I worked out a system for playing through the single player story. I really enjoyed resource collecting as a worker, and he enjoyed fightin, so I'd resource it up in the beginning of the battle and upgrade the units, and he'd do the fighting necessary to finish it off. It worked out splendidly and was quite fun!
There are some things about the game that are very hard, as though they didn't get enough noob-testing in. We gave up on the lava level after trying again and again to make some headway and failing each time. I feel like it's the kind of game which, especially in online play, can end up being like old school Alterac Valley, in an endless stalemate. Though, even in the long games where little was made towards the end goal, I still noticed a lot of little gains and advances and retreats going on throughout, so that was pretty cool.
I was actually surprised at how little the Fat Princess gag actually comes into play, as most of the time is spent as different units - gathering resources, capturing holds, killin dudes and whatnot. The time for actually capturing the princess seems very short and swift, regardless of how many people it takes to carry her. It didn't feel like the focus of the game, but I guess the gimmick helped sell it a lot more than a generic capture the flag theme.
Anyway, I loved the ease with which you could change units, and the theme of putting on a new hat makes you a new unit was delightful. I also loved that each unit is rewarded with points for doing its job, so the worker is rewarded for cutting down trees and mining ore. It helps make those players feel valuable and rewarded.
In the end, I feel like I would like to finish the story mode for this, and like it's the sort of game I may drop into online play for now and again. Once you understand all the units, it's easy to pick up and get going, in a very "Castle Crashers" sort of way. I'd say it's worth a try for sure.