I agree. Soldiers poem, invincible, city of delusions, and hoodoo were all kind of downers for me. However starlight, supermassive black hole, map, exo-politics, and knights of cydonia are really good.
This is the order that I would rank muses studio albums:
1. OoS
2. absolution
3. the resistence
4. showbiz
5. BHaR