Watched avengers, avengers age of ultron, iron man ( all parts) , captain america( first avenger and civil war both) , hulk ( both parts) , and spiderman ( all 6 parts including amazing spiderman and homecoming) so you can count me in the list of those die hard fans of marvel universe.
The previous movies have been viewed by me over 3 times each.
And this can be said without even watching the trailer that the movie is going to bring revolution in superhero universe.
Thanos is not going to get defeated so easily so 2 movies are dedicated to infinity war, this proves the power of thanos.
To get an idea of how powerfull thanos is you can see the first avengers movie in which the son of GOD( Loki) is defeated in a single movie, but to beat thanos all the avengers including gaurdians of the galaxy and dr. strange have to appear in 2 movies just to defeat a villian stronger than gods.
Lets wait for the trailer first and then the movie( omg 2019 seems too far! )