I personally love that they keep track of nearly every character that has ever been printed under their label. At least moreso today. 616 Marvel's stories don't have the sliding timeline, so Spider-Man might as well be 50 years old. That or those earlier stories never happened. Except they might've but more recently. Except you never know. Regardless, if a comic features characters you don't know or want to get to know: it's not made FOR you.
My only real criticism with Marvel though is Ultimate Comics. They rebooted/tweaked the reboot of their ENTIRE UNIVERSE. Ultimate series were the alternative to the complicated 616. Then Ultimate became so complicated they had to re-work IT into Ultimate Comics. At least with DC there's a concentrated effort to keep it all under one banner.