Dodson and Benavidez are great wins and both are underrated. Horiguchi and Cejudo are very good wins too; MM just caught them a little early on. Heck even the win over Ali was impressive - Outcardio'd a guy on EPO. Moraga, Elliot, Reis, Cariaso are all journeymen but he beat the breaks off them all apart from Elliot, who is a huge flw.
I don't think the answer is as straightforwad as people are making it out to be, but Fedor is a hero to a lot of people and DJ is a scared manlet. Cro Cop and Nog are fantastic wins, and then you have big names like Coleman and Randleman (he was a good athlete and hit hard) who were wrestlers who couldn't defend submissions, and then there's Hunt who was admittedly much bigger, but the guy was a novice on the ground. I know he beat Wand around this time, but styles make fights. Fujita wasn't anything special. Ogawa and Goodridge are decent wins but imo he has two opponents from the list here that I would consider elite mixed martial artists.
Benavidez and Dodson are elite in my mind (certainly at the time of fighting), and Horiguchi and Cejudo are undoubtedly elite now, and were good, (perhaps better than good) fighters when DJ fought them.
If I had to make a top 5 out of the names, I'd pick Nog and Cro Cop from Fedor's opponents, and then Dodson, Benavidez and Cejudo from DJ's. You can argue about how dangerous HW is, how Fedor had a size disadvantage, how flyweights have no stopping power, how DJ is a manlet and how Zuluzinho would be able to eat all of DJ's oponents in 3 bites, but this isn't a blowout in Fedor's favor at all imo.