First and foremost I have to say that Bas IS the nicest guy not only in MMA but in the world. THe guy is awesome and a amazing fighter
now there is the question the validity of his PANCRASE FIGHTS
Now, he has always said that none of his fights were "works" and I take him at his word actually. So, I think his win number isn't inflated by wins that were "works". However, alot of fights in PANCRASE (at that time) were works (youtube search Ken Shamrock vs Matt Hume for a example)
Also, I think he gets no credit for actually taking the time to improve his overall ground game. Granted he is no Gunnar Nelson on the ground but he is very proficent for a guy just started out as a Dutch Thai boxer
Despite the two losses to Ken Shamrock (and that isn't a knock on Ken; i'm just pointing out a huge blemish on Bas' record) Bas is easily in the top 10 all time