I have no doubt that he was highly touted but it's hard not to look back at a guy with a big size advantage only putting up 45 points in 62 games in the OHL in his draft year (6th on his team in scoring) and ended up being a consensus top 10 pick in what was a strong draft and think of the problems with scouting in those days. Even if you just absolutely had to take a really big dude Glen Murray fits that bill.
GM's were in love with trying to find the 'next Bob Probert' after his showing in the playoffs in '88.
Expending a 1st or 2nd round pick and trying to find that guy became a trend that probably lasted 15 years.
The Canucks drafted Stojanov and Antoski, and traded for Mike Brown (Panthers 1st rounder in '97).
Stojanov's 25 goals in 62 games in the OHL that season compared favorably with Murray's 27 goals in 66 games, no???
I don't agree it was 'problems with scouting in those days'...
Fighting/intimidation was still viewed by some GM's and coaches as a very significant part of the game, especially in the playoffs.
Probert had showed himself to be a rare 'impact' player in those '88 playoffs.
Consequently, if you could get your hands on a guy that had the same soft hands, but could buy himself and his teammates some extra ice, without the off ice distractions, you had a gem on your hands.
If you read those blurbs above, it's clear it wasn't just the Canucks that were looking at Stojanov. He probably went a lot higher than he should have because the 'Nucks knew he would be gone soon after their pick.
But, again, I think you're somewhat discounting the impact his shoulder injuries and subsequent reconstructive surgery had on his career.
Aside:
Both Stojanov and Antoski had horrible car accidents...but it was Antoski (not Stojanov) that had the metal plate inserted in his head, and the subsequent injury involving his dog.