Lets face it. Itachi is dead and he did alot more than Minato till now.
Itachi in a few chapters stoped Nagato, escaped from Kabutos control and in the end stoped him along with all edos.
Minato is just there and doing nothing - losing his arm, leting Obito destroy ninja map and now doing nothing to stop Madara.
If i could choose between Minato and Itachi who should fight Obito/Madara I and 90% people would choose Itachi. The rest 10% is just fanboys.