Hello Steven
First question of who/what am I the short practical answer is nobody/nothing.
Am I being objective or subjective? My subjective opinion is I don't like this at all and wouldn't want to ever hear it again. That's a polite version of my personal opinion.
So I feel what I gave was objective and tried to give positive and constructive consideration to the song.
What would I do differently... I don't have the time or incentive to go into this too far so I'll just chuck out the first thoughts as it were. These things I may or may not do.
The guitar - double track a 4th or 5th above and/or double track with suspended or augmented chords - I'd do this to give the sound more movement and dynamic.
Vocal - double track with, perhaps, phase quite low in the mix. A little more counterpoint on the chorus. To add a bit more change in sound and open it out a bit. I'd like a little more change in the feel/sound as the song continues. The secondary vocal is mostly too near the main vocal for me in sound and style.
Add a little sparse keyboard to pick about the melody a bit. Not the complete melody but the passing notes.
(Now I've written that I'm less convinced it is what I'd do

but that's the area I'd play about with, try to open the sound up and make it less homogeneous.)
On the question of style, the song is very polished but for me lacks distinction. It's not a recognisable sound. True many catch naff songs have scored but I don't think this is particularly catchy.
It's well played and very polished but it's the grit that makes the pearl.
Sorry I don't have the time to elaborate but I hope this little bit will clarify my opinion some.
Regards
zoo