Meh.
I'll give you a 4/5, just because GTO is the greatest anime/manga EVER.
The system worked, I liked the combat sequence, and the art was excellent (though mostlikely traced).
Otherwise, it lacked action, storyline, the ending was mediocre at best and it really didn't give many people an eye into GTO.
And please don't call this a dating sim.
It's not.