Sadly, Mario doesn't have any working joints, so the scope of his usefulness is somewhat limited. Without something in his hands, he's just standing around with his arms outstretched and his palms up, like he's weighing options or waiting to be handcuffed. However, just because this figure is a single-tasker doesn't mean he's a one trick Yoshi.
For example, here's Mario holding a DSi:
And Mario doesn't care if it's tiny. Here he is making a Gameboy Micro look huge:
Past your prime? Mario don't care. Here he is rocking a Gameboy color:
Have stock in Energizer? Mario will gladly pimp a Game Gear:
Connoisseur? Mario's got you covered:
Mario palms Link:
K.C. Munchkin under control:
24-bits of holding power:
Oh Jesus. Now Mario's just holding himself like a gangster:
Mario! Where the hell did you get that?