The graphics card that you have is an integrated one, and despite having more than the required amount of memory shown, it still isn't good enough. Video cards aren't just about the amount of memory you have, there are many other factors that go in to play. If you want to get an idea of what your card can do, either Youtube the name of the game + your graphics card, or go on Notebookcheck and look for your model. Hope this helps.
It just so happens that 'Can You Run It' specifically mentions a failing grade for just about anything from Intel. The way the diagnostic is run, it quite literally checks and says "oh it's not nVidia and it's an intel? Fail!" - despite the fact that many of the games it provides a fail grade to are quite playable with our processors.
Take it with a grain of salt.