Even if Bob admits the source of his bias, wouldn't he come across as more professional, if he could at least give some kind of recommendation for a movie he didn't like/hate, to other people, who may have different taste, or opinions.
Like say, at the end of the Amazing Spider-Man review: I really don't like it, but if some of you out there didn't enjoy the Raimi versions, and wanted a different take on the webslinger, maybe you should check it out and perhaps you will like it.
Or give a shout-out to Scream fans at the end of the hate filled Scream 4 review, that maybe people who like or love the franchise, should go see it, because if they liked what the franchise previously offered, it has more of the same, but no, Bob just couldn't get past the fact he hates the Scream films in general, because the first movie popularized referencing movies, which was his thing but after that became more mainstream with everyone and he wasn't so special anymore.
I still watch every MovieBob review, but I realized soon enough, that his tastes differ quite from mine, and that I personally shouldn't take his negative reviews seriously. He can make things seem interesting, and worth checking out, but when he doesn't like something, there's never even a small indication, that other people with different tastes should go see it, never thinking other people might enjoy it.
His reviews aren't always based on bias, but the ones that are, just feel like some sort of small effort, to scare away as many people as possible, to ensure the movie's failure.
P.S. : Just went back and watched his Scream 4 review, and the people in the comments were already writing, that it's clear Bob is going to hate the new Spider-Man when it comes out, and that was in April 2011.