Saunders is an okay player who will likely get better in Toronto but he's not 'fap-worthy' imo. It's a good trade for us mainly because the value he will likely provide exceeds his salary, allowing us to make a play for someone like Lowrie and/or one of the mid tier SPs. I don't think this trade is that bad for the Mariners, Happ will be solid there, the problem is that they presumably could have gotten a Happ type without giving up Saunders.