I actually didn't mind the Warehog sections. Did it make any sense? God no. Did it get a bit repetitive, yeah a bit actually, but for the most part satisfying even if. I wasn't really bored of it. Though I love the swing battle music, I do wish they added a different song for later in the game. You can only stomach that beginning Eb Minor progression lick for so long (but that kick ass drum solo though ).
Back then, the 360/PS3 versions of this game was a breath of fresh air. The Hog Engine performed beautifully and it was a return to form that Sonic fans were desperately waiting for. Most other major sonic games were modeled after its approach which should say something. That said, I kind of felt Unleashed had a better 2D Sonic system then Forces, and even in the 3D sections, Unleashed at least had a drift system which was kind of cool. Levels were also a bit longer vs Forces which was more of samples of levels vs actual full levels. Forces also felt a bit stiff to me (also neither come close to the authentic mechanics as Mania...(then again, even SEGA said that Mania was meant for the classic sonic heads...or that's just their excuse for not getting some of the classic physics right )