Are you kidding? He had a great arm...
Marino had a top tier arm. Not the strongest but definitely far above average. Tua has an average arm, similar to Montana. Hopefully Tua can use his accuracy in the same way both Montana and Marino did. I have faith in is accuracy, intelligence, work ethic and leadership (although I want him a bit more aggressive).
I once had a conversation with former Dolphins QB Scott Mitchell, who lived near my USA home and coached the local High School Team. I asked him about Marino. He said: "Dan was a big Italian family guy. Some of us thought he was a jerk, until we understood that he was only about winning. Then we understood. Dan Marino was the best QB I have ever seen."
It was fun to have a conversation with Scott.
Tua will never be Marino, but he can be a great QB and hopefully get that SB win that Dan wasn't able to achieve.