Plaster is on the one hand, harder to repair correctly, but on the other hand, can be repaired more seamlessly if done well.
It kills me when people replace plaster with drywall. Sometimes they'll even have it all torn out and replaced because they just need to do some repair or are doing a renovation and just want all the mess to happen up front and tacking drywall up is cheap and easy later on. So stupid.
In my last house I retiled the tub and behind the tub they had mold-resistant drywall that they used as a tile substrate (this isn't proper, but it's common enough that people think it's proper.) The drywall was nailed into plaster, which itself was covered in wallpaper. Taking all this down to fix it I found the wallpaper and drywall was moldy, but the plaster itself was not moldy. The spores just wiped right off. It's great stuff.