I haven't had many positive experiences with emulation, but ActRaiser was an exception. When I was attending college and living in the dorms (so... a long time ago, when my wife was still my girlfriend), I downloaded the game and played through it in one night using the default keyboard setup. It was awkward but I was addicted and cleared the whole game. The only other truly positive emulation experience that springs to mind is when I downloaded Paperboy for NES and beat the whole game without losing a single Paperboy (again controlling things with the keyboard).
I own both games now in cartridge form. ActRaiser is still a great game, as it always was, and the sim elements remain enjoyable without ever becoming a chore. The game doesn't hold up if you're expecting a hardcore experience, but ActRaiser was a great idea and I've said often that I wish the Quintet team could develop a new ActRaiser game using today's technology. It might help us all forget about ActRaiser 2.
"Too often we enjoy the comfort of opinion without the discomfort of thought." - John F. Kennedy on reality
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world