Great list. I would downgrade 1916 from close election to nail biter. A 277-254 Electoral College win is quite a squeaker, and less than four thousand votes saved Wilson in California from defeat. I also disagree with 1824, 1836, 1856, and 1860 as being landslides.
OP wasn't making subjective judgement calls, he was categorizing these elections into clearly defined objective categories based on popular vote. The only way to disagree with these categories is to be wrong.
I understand the set criteria. My point was that despite the categories, I wouldn't personally consider 1824 as being a landslide as well as a few others. I have my own PERSONAL criteria for what a landslide is. Also, I clearly said great list, knowing how and why he grouped each election into each category.