Collinsworth isn't all that bad, he is 1000% better than he was before he started on SNF. Well, the first few years he wasn't that good, but improved. He changed about the time Dez was drafted to be more positive.
He usually seems to favor the Cowboys IMO for the most part. Not favor, but not a hater like he used to sound.
When everyone was ragging on Dez in his first few years and all the off the field stuff. Which really wasn't an issue. Collinsworth actually defended Dez. Said the Cowboys have something here and he just needs to mature a little bit. And the off the field stuff was nothing to be concerned with.
Now Aikman on the other hand is more biased ugainst us on broadcasts. Though not always as bad as made out to be either.