Wildest Dreams is easily better than Different World, Tailgunner, and The Final Frontier, and you might be able to sell me on a couple others.
Anyway, here's my first stab at a Blind Guardian ranking:
1. Nightfall in Middle-Earth
2. At the Edge of Time
3. Imaginations from the Other Side
4. Somewhere Far Beyond
5. Tales from the Twilight World
6. Follow the Blind
7. A Twist in the Myth
8. A Night at the Opera
9. Battalions of Fear
Mortals are mortar and life is the fuse.