[Dr Kain]

Sandman himself is just fine, it's that they need to give him multiple accessories that make use of his capabilities.

Frankly though, the only three Spidey villains I think need the Maximum treatment are Mysterio, Green Goblin, and Hobgoblin. For Mysterio, a wired cape with multiple effects is the best choice. For the two goblins, aside from also having Hobby with a wired cape, they could finally give us proper sized gliders so we can do poses they do in the comics. Like the one where Hobgoblin smashes through the window with his legs full stretched out. Not to mention the various heads to do for each (Norman, Harry, Kingsley, Jason, Ned, etc), razor bats, pumpkin bombs, pumpkin bombs that are in mid-explosion, beams from the pointer finger, the ghost bombs, etc.