Bucks with good looking racks on the hoof, will get the comments of "That's a nice rack" when on the ground. But big bucks look HUGE on the hoof. Period. They get the "Holy #$%@, is that ever a big buck",comments when on the ground.
Rack score isnt everything, especially net. Gross B&C is a better judge of a bucks overall quality.
Weight is another factor. For a lot of hunters, a buck that dresses out at 200+lbs is a true trophy regarless of rack size.
Regardless, a trophy is in the eye of the beholder. I know of one hunter who has hunted boreal forest for the past 30+ years. Until 3 years ago, his biggest buck was a 4x4 with no brow tines that might have scored 80 inches B&C. In the 2009 season he scored on a 5x5 that would gross around 140 inches B&C and if you would have asked him, he would say he killed the next world record whitetail.To this day his grin is huge when retelling the story of his monster buck.
There is nothing wrong with setting goals and holding out for that trophy buck, but you are the only judge that matters. If you think he's a trophy, then he is.
All that being said, I'd say a Manitoba buck scoring 150+B&C inches would be a trophy in anyone's books.