The Mc seems refreshing, if you're put in his place you'd probably be in a more irrational state or extremely emotional (well, that's how a normal person would react), in this case, the MC shows a rather logical decision but ethically questionable.
As readers, we find the mc a bit repulsive, why? because he did something morally wrong, like using the girl. But if you tried to look at it in an objective perspective, I'd say it's alright, the Heroine (Probably the main girl) was said to be useless, so the mc just used her in more advantageous way.
So to sumarize, The MC has a bit of a trashy personality but he is logical (kinda). Just my opinion.