IME it tends to run very old games written for the original PC better out of the box. With Dosbox you have to fiddle a bit with the cycles so they don't run too fast or too slow.
Yes, but its x86 emulator is unfortunately very slow. I wanted to re-experience the little click game "The Green Mouse Disaster" and barely got it running, with only a few frames per second - practically unusable. This game is built on Shockwave and contains some Qt-based movies as animations.