Tylenol only works for relatively low levels of pain, which tends to be relatively short term. So abuse is not very common, and even with chronic pain, Tylenol overdosing kills quite quickly, it doesn't have time to become a habit that takes down entire families together with the chronic pain sufferer.

Either way, we don't have to assume, we can directly check the numbers. Per another commenter, Tylenol kills about 458 people in the USA every year. In contrast, death from overdose on illegal stimulants was estimated at ~33.000 people in the USA.

Now, is it fair to say that Tylenol is more dangerous than marijuana? Of course. But to say it's more dangerous than most illegal drugs? Obviously not.