iDoubt guy Hasn't giv'n some attention to the other forms of combat. But imagine if he put as much time and energy into Gen-Nin Jutsu like he did taijutsu. Guy would be Kick-ass.
If he did that then Guy would suck. Think about it.
If he spent the same amount of time in each of the three jutsu categories then that means he would spend 2/3rds less time in taijutsu.
Which means that he would be much worse in taijutsu then he is now. And in worse physical condition.
And a version of Guy that was not in peak physical condition would not be able to open up the gates without killing himself.
Add into it that he said himself he wasn't that skilled in ninjutsu and that puts him in the low jounin category, because his training would be necessary to put him on par with other jounin.
Genjutsu. I'm not even going to bother with this as very few ninjas actually use genjutsu, and of those few that can, even fewer can use it well. Guy does not have the intelligence or skill for any genjutsu of worth.
So basically Guy should stay the exact same because if he spent equal amounts of time in each category he would be a low-mid level jounin (at best).