You gained better targeting precision and speed, and many mice have SEVERAL buttons outside of right and left click. Mine only has 4-7 depending on how I set it up, Naga has more but I don't like Razer products. Unless I need 30, 40, or even more hotkeys, i'm set. In fact with my mouse I typically have 6 functions using buttons on it alone, another 6+ using Modifier keys.

So, yes, I CAN say it's better. Not to mention my comparison is against a gamepad. Not a standalone keyboard. Keyboard keys are all on/off, there's no.... precision to movement and such with a keyboard. Even a Gamepad is better for movement than a keyboard alone.