DC is conservative, the company ideology is that the heroes they produce are absolute, they are above the people and are their noble protectors. Look at Superman or Batman: both of these individuals are seen as an extension of the law in the DC universe. Heck, The Flash is pretty much seen as a member of the community like the police or fire department. The point is, everyone loves them and their lives are pretty much perfect.
Marvel, on the other hand, treats its characters as average joe’s: some are despised for who they are like the X-Men, can’t catch a break like Spider-Man, or is a recovering alcoholic who constantly questions his own ethics like Iron Man. On top of these problems all the heroes mentioned above were at one point or currently are wanted criminals in the Marvel Universe. The point of the Marvel Universe is that all the characters are human.