The N900 was a "great product" iff you wanted Linux on a phone. It had a bunch of frustrating shortcomings otherwise, and minimal software outside the Linux-on-a-phone use case.
The N9 was the only truly great product (as in a regular consumer would have found the UX appealing). And that didn't really together until AFTER Elop told them that they were all doomed. Only then did they stop playing politics long enough to build and ship something amazing (Harmattan on the N9). Kind of like how at the end of the world, everyone seems to get along better because there is no upside to triumphing politically.