"Finally"? Wow you must have been very active in Gauntlet recently then - congrats! I have 305 frags right now, and this includes the frags from the recent events like the Arena event! We still have plenty of time to get the mariner, right?
But yes, I also think he is not so powerful like some other new characters, even compared to some 4*. But I think he looks amazing and I will be happy to welcome him in my benchwarmer team