Most Helpful Girl
To the letter of the law, probably opinion. Saying MJ has more than 32,000 points in his career would be a hard fact.
I still say it's a fact, because because good has a defined meaning and his many stats that are well above average support that statement. Same as something like "drinking and driving is dangerous." Stats support that.
Now, saying "Michael Jordan is the best player in the history of basketball." would be opinion because there isn't a clear consensual on what "best" means in the context of that many different stats and factors.