The Jedi Mind Trick is easily the most unimpressive of all the Jedi powers. Even Force Climate Control is more impressive. The reason this power is so underwhelming is the high fail rate. Seemingly every time it would come in handy, the practitioner manages to come across a species immune to its effect. There is also a high risk reward factor with the Jedi Mind Trick. If successful, there's nothing better, but if it fizzles you feel like a real asshole and it's followed by an awkward moment particularly if you were attempting to use the power illicitly to curry sexual favors. It's the Star Wars equivalent of getting busted taking a peek down a chick's blouse.