I think we should all note that the times are changing. No one can accomplishe the same things that GSP, Anderson, Fedor did. There will be more losses, less winning streaks, less dominant performances...
You can't compare the early 2000's skill level to what we have right now, the heavyweight division and the LHW division are the only two that you could say that they are less skilled than before, but even for those divisions the top 10 is still way better. Go back to when GSP, Anderson and Fedor started in the big orgs, they were beating the best fighters of the time but they were smaller, less skilled fighters and most of them had blatant weaknesses.
WMMA and the men flyweight division seem to be stuck in those eras due to the lack of fighters
Fighters skills are a lot better right now, everybody has great MMA training, everybody has good enough submission defense and ground and pound defense... Clean records and long winning streaks will be rare, super dominant fighters that finishes all the time will be rare.
We should consider this for the time being or we will be like old guys remembering Babe Ruth and Joe Montana and not appreciating what's going on right now.