Yeah, it definitely feels weird to rate a cemetery. But at least it's the nicest cemetery in the city.
Mount Pleasant is in that nice area of uptown where there are lots of street level shops but you can still see that there was once grass beneath all the concrete. The area already has a lot of gorgeous public parks (especially around Lawrence) but Mount Pleasant takes the cake for gorgeous.
I have a couple family members buried here (mostly in the indoor portion) but I do love walking through the area and exploring. Definitely creepier at nighttime (and a much higher possibility of getting lost in the huge space), but it's actually kind of pretty during the day.
If you live in Toronto and have never been to Mount Pleasant, it's definitely something you should see, because everyone knows at least one person buried here (even if it's just the people who owned Eatons).
For tourists, if you can get over the fact that it's a cemetery, it's definitely a nice peaceful day trip, in a really nice part of town.