"Gangsta's Paradise" is easily Coolio's most recgonizable song and his most acclaimed album by critics and mainstream outlets. But "My Soul" is among his best work, along with "It Takes A Thief".
You can essentially break down Coolio's albums in this manner.
Step 1: Disregard the singles when judging how good the album is. He always puts out good singles, but critics and casual rap fans tend to judge his album solely on the singles.
Step 2: Compare the rest of the songs (the songs that bandwagon fans consider to be filler)
My Soul's singles weren't as outstanding as his previous singles, which could be a good thing. Not necessarily a good thing for the record company or for Coolio's career/pay-day. But it allows the listener to get deeper into the album without distraction.
The best songs:
.2 Minutes & 21 Seconds Of Funk
.One Mo (the voice-box hook is perfect)
.The Devil Is Dope
.Ooh La La
.Can U Dig It?
.Can I Get Down 1X
.C U When U Get There (not my favorite Coolio song by any means, but it grows on you)
^I listed about half of the album, and the other songs might be your preference...that's how consistent the album is. It really is some of his best work. I prefer "It Takes A Thief" for it's funk influence. However, you should definitelly check this out. Don't let the fact that it wasn't a huge commercial success scare you away, you'd be robbing yourself of a great album.