That's your personal opinion, which you're quite entitled to.
Your argument is a bit flawed, though. If more people have been on a particular ride, that doesn't necessarily lead to higher average ratings (in fact, in some cases, it can lead to a lower score). Plenty of people have been on (and rated) SheiKra and Cheetah Hunt - and while I agree that they are both great rides, they don't score as highly as the others on this list. It seems that not everyone shares our opinion of them.
That's probably because a lot of theme park visitors place more emphasis on theming than on coaster design. I've no doubt that if this survey was exclusive to members of coaster clubs etc., the results would be different - but it's not, it's a survey of ALL theme park fans. The simple fact is that a lot of people would rather ride the Mummy than Millenium Force. Does that make it a better ride objectively? Maybe not, but I think using multiple people's opinions to determine a list like this is more valid than using just my own or those of a handful of hardcore coaster fans.