Alright, I'm going to give this first one a shot, so here goes. I've already heard the album and I love it [4 of the top 14 most played songs on my iTunes library are from Thriller] but I'll 'review' it anyway.
1. Wanna Be Startin' Somethin'
Catchy opening track, and it sets the mood for the rest of the album for sure. I personally find it a bit repetitive sometimes and that's why half of the times I listen to Thriller I'll skip over this track, but it's still way above average as pop goes. That "Ma Ma Se, Ma Ma Sa" part at the end is my personal favorite part of the song.
2. Baby Be Mine
The backing beat is alright and probably the main "hook" for this song, but otherwise this song isn't too great. It's probably because I'm not too big of a fan of those 1980s soul/R&B ballads and this falls into that type of category. It's like a Whitney Houston song, almost, and that's just not my style.
3. The Girl Is Mine
This has to be one of my most favorite romantic songs, and a large part of it is the duet pairing of Paul McCartney and Michael Jackson. It slows down the pace of the album but still does not sacrifice quality. It scores big for musical quality and for romantic meaning behind the words. [Nohomo]
4. Thriller
One of the greatest pop songs of all time. Needs no introduction and no description at all. It's flamboyant, catchy, upbeat, and over time the massive pop culture appeal of the song has just added to its overall value.
5. Beat It
I guess this would probably be one of MJ's first pop/rock crossovers. E.V.H. on guitar provides a sick basis to this track and Jackson's vocals are right-on. As a guitar player, I love that solo at the end. There's few other songs which are so fun to air-guitar to.
6. Billie Jean

Another tempo slowdown but this song is still epic...personally, it's my favorite song on this album. The lyrics are ICONIC, and the bassline is recognizable in a second.
7. Human Nature 
Never cared much for this song. It's not bad, I guess, but when you've got a song like this in comparison to three of the greatest pop songs of all time in a line, it's obviously a sobering step down from a "music high".
8. P.Y.T.
Sorry for this being the FOURTH 5-star song, but this IS one of the best albums of all time and therefore, it's entirely warranted in this case. This is a good dance song, and it's a great "get-in-the-mood" song. Very useful for practical purposes.
9. The Lady In My Life
It's not excellent. I'm more astonished that MJ actually had a lady in his life [instead of a group of little boys] than I am astonished at the quality of this song in any way.
32/45 = 71%