Didn't Allmusic.com used to have reviews of individual songs? I know that Adam & the Ants' "Kings of the Wild Frontier" had over half of its tracks individually reviewed - but I cannot find where to read them now.
And there are several others. I think your memory is faulty to some degree and you were thinking of another album. I don't think they were particularly common either. My recollection is that only the big hit songs got the treatment and mostly for those that were twenty or more years old because they had a bigger staff back then.
The other thing is that AllMusic is ineffective at linking songs to all of the albums that they appear on. It's not unusual when using the Songs tab to find the same song listed three or four times and linked to different albums. This is especially true when there are contractions, abbreviations or alternate spellings of a song name. So a song may be reviewed but linked to a different album than the one you are studying.
If you look at an album listing, there'll be a page icon next to songs that have a review. Wouldn't it be swell if that same icon appeared next to the very same song when you were using the Songs tab? It doesn't.
But now you can make wishlists so it's all good, right?