Tommy Morrison was a good fighter, certainly Top 5 out of about a thousand licensed Heavyweight boxers. He didn't have that little extra bit of talent that makes a man Top 3 instead of top 5, and Morrison was on steroids.

Plenty of guys in MMA have tested positive, and they were not the outstanding fighters.

EDIT:
"If he used roids", Of course he used them!
From about 1988 till now, for 25 years, he's used them!