Lacking, but excellent!

Pros:
- Excellent photography
- Plethora of classic figures categorized accurately and dating all the way back to 1964
- Overall extraordinary amount of useful info
- Great tool for Bricklinkers

Cons:
- Minifigures names did not always match the official LEGO names given to them
- Not entirely up to date. (e.g. CMFs stopped at S2)

Conclusion:
Good buy for those hard core LEGO fans and especially in the case of BL users

MinifiguresPlus.com about Unofficial Minifigure Catalog