Odin's spear is Gungnir, but I don't think a spear is a good toy. Lightning is a nice showy thing, sure, but it's not the same nature as a melee weapon. The hammer is good, from an image and toy perspective. I think an axe can also work, though not a sword, for Thor, but I think he is Mjolnir in a way that movie goers see. Otherwise, the breaking of the hammer wouldn't have really mattered.
Captain America could do great without the shield, give him Daredevil's tool and he'd be doing great, right? But Captain America IS his shield. Thor IS his hammer. Contrast to Black Widow who has no defining weapon and is sort of just there sometimes. Even Hawkeye is the guy with the bow...
This discussion being a movie goer/ general public thing. Actual comic fans are like abused spouses that keep going back, so they are happy for changes that mean maybe this time things will be different.
When I read Xmen back in Ye Ancient Days of Yore, it just wore me out and I gave up.