Bruce had two trilogies of albums: the experimental ones, and the metal ones.
The experimental ones have a lot of hidden gems, it gladdens me to find Skunkworks fans and also Balls to Picasso had great songs and in some cases, even greater B-sides and leftovers. Tattoed Millionaire is kinda weak but it has at least a masterpiece (Son of a Gun).
The metal albums are two absolute masterpieces, one being considered one of the best modern metal albums of all time (at least all the time that starts from 1990 onwards), and a very decent and solid one.
All in all, I say it's a very solid, and diversified, solo carrer. Let's see how the Mandrake Project will round it up!