Ok first of all whoever says that someone is unbeatable is just pure dumb... under the right circumstances anyone can be killed.... well except for Minato (hahaha joking xd ) Maybe except for the SO6P i mean he had the perfect izanagi and the Rinnegan.
Second don't underrate him either... saying that FTG is a simple jutsu just like a dumb summoning is just wrong... Many knew about his FTG but no one has ever used it... i mean The Third could have known it at least. So there is more to that jutsu than we know...
And there will always be fanboys but let's try to put that aside... Minato is one of the greatest ninja out there... and he is a legend in the ninja world. He fought Madara, and the 9 tailed fox... managed to save the Leaf village, and his son.
He is certainly not a god... but he is up there with other legends, other strong and smart shinoby.