Minato was designed the way Kishi chose to, if you don't like it go complain to him.
Minato doesn't deserve all the hype and credit? Of course he does, if you don't believe it you must be either a hater or you don't actually understand all of what he has accomplished, and the reasons why he as so renowned.
Also stop comparing Minato's fight with Tobi and Hashirama's fight because:
1.Hashirama didn't really have to worry about the village's imminent destruction, if he lost the fight Madara would have most likely taken over Konoha, he might have destroyed it or not, but the whole village wasn't in danger during their fight. On the other hand, while Minato was fighting Tobi, he also had the Kiuby destroying the village.
2.Minato just became a father and saw his son in danger, then he saw his wife close to death, and his village being destroyed... no matter how prepared and calculated you are, this sort of thing will affect you, and put allot of strain on your mind and feelings.
3.There is no proof whatsoever that Madara had the same abilities while fighting Hashirama, it is clear that he didn't have the powers he once had while fighting Minato, but i doubt he would be so injured if he had his S/T jutsu and his phasing ability while fighting Madara.
So even though they fought the same opponent, the surroundings of the fight were completely different so stop comparing them, it's just dumb and useless.
Even though we only saw him perform 3 jutsu, they were his own, and actually the strongest jutsu out there...
And the ending of Minato's encounter with Madara was decided by Minato, he was the one who chose to rescue the village, and also sacrifice himself for the future of the whole shinoby world actually...