Never played at the original arcade counterparts because I KNEW I wasn't able to go over the first screen!
The first Dragon's Lair on Amiga was really frustrating, because too much disk swapping, even with the walkthrough, I got myself annoyed very soon.
Better luck with Singe's Castle, but never finished.
Space Ace, still not so good, but VERY close to the original arcade. I was able to finish it all by myself without any walkthrough, but I took a LOT of time to do it...