I am Swedish, so I guess I´m biased. No matter how great a general and "good guy" he was, one important thing remains to be said. He ruined Sweden. Sure, he conquered a lot of land and made us famous and important, but he ruined Sweden´s "economy" as it was back then. His endless war emptied many towns and villages of young men leading to more and more people moving to the cities were overpopulation and extremely bad sanitation became a huge problem, yet Gustavus never even attempted to do anything about this.
He basically set back Sweden´s economical and social progress by decades.

Not saying that he wasn´t great at what he did, nor that the German and Polish ports didn´t make the crown any richer, but most of that money went to funding even more war anyway, like that big ship that sunk on its maiden voyage.
He (or actually Oxenstierna and co) did do some good work with Riksbanken and the goverment reforms, but overall I wouldn´t say he was really that great for Sweden.