I'm not a huge marvel person - saw and liked the avengers, but missed most of the others.
I liked Quantumania quite a bit. The "world" they created was fantastical and cool looking. It was funny at times, good action, decent story. I mean, it's not an award winner but definitely above bar for being worth the price of a ticket.
Also, it's only 2 hrs 5 min long (actually think it clocked in lower) - so not one of those horribly long movies.