[Mimosine,
You said " ... what is the point if it says 80% pen?"
A game with really good pen' and BAD rules is almost always preferable to a game with very good rules but BAD pen'.
Really, this is a crucial canon of Card Counting, that has been repeatedly proven by massive BJ simulations with appropriate software.
It is a subject well-covered in "Blackjack Attack", 3rd ed
Depends how bad.a game with bad rules is NEVER preferable.