I'd say I wanna be your man and what goes on aren't that fun at all just really fast and they tire me out and I've been playing expert for awhile. They are the most challenging in the game though. Thats like saying Through the Fire and Flames and Raining Blood were the funnest songs on Guitar hero 3.
My top 5 favorite songs to drum (not in any particular order) are within you without you, Polythene Pam, The End, Here Comes the Sun (the beat is awesome in that song), and I me mine
Hello Goodbye is pretty good too
I actually find I Wanna Be Your Man and What Goes On very fun.
I can actually complete them so that adds to some of the enjoyment.
I hate I wanna be your man, its a friggin arm burner. But I can FC birthday on expert drums pretty regually thats the most fun song IMO................Not to easy not hard but just right, snare rolls fun too.
Hello Goodbye used to be one of my favorite songs on drums, but now I've kind of forgotten about it with all of the new songs we have to play now. My current top 5 drums songs are.
3.A Day In The Life
the funnest drum song is definitely Hey Bulldog