Cool gadgets can obviate the need for superpowers but even Batman has incredible strength, agility, fighting skills, and recuperative powers. Green Arrow's superpower is his uncanny skill with a bow and his specialty arrows are his cool gadgets, but he'll undoubtedly have Batman's physical skills as well. Let's face it: to be a legit superhero you have to be superhuman at some level.
And I repeat an earlier lament: Green Arrow without the VanGogh beard is an lame imposter. Heck, he wouldn't even have to grow one; it could be part of his disguise. If he's got time to pull on the hoodie, he's got time to glue on the beard, I say!