So after reading it, I would say that Black Spear is a really really good read. Mr. Brooke knows Glorantha a lot, like really good. And the Adventure is grand in the scheeme and the players will encounter many Gloranthan weirdness. So why only 3 Stars, well as I said it is a good read and also a wealth of ideas for you Glorantha stories. I think it is a not so good as an adventure, lots of dense Text and for my taste almost a tad too mutch Railroading/Pushing the players. My best comparison would be old White Wolf "adventures" for Vampire. So I would never run it but will take it for Insparition for my own adventures and more Glorantha weirdnes.

Disclaimer, i would give it 3,5 stars if i could.

So I like the Rule changes, it is still Crunchy with the fat trimmed off. But I pay more and get less then the prior Edition (RMFS). The Basic Spell Lists are missing and there is no Basic Monster/NPC chart. With the prior edition I could directly start off without the need of additional Books.

So the rules are optimized, the Skills trimmed, but i get less Content for my bucks. If this is your first Rolemaster Book go for it, just remember that you have to buy the Spell Law to play Wizards and Co.