Ok, my knee is killing me for reasons of my own doing, so I'm not in a charitable mood. The overall advice you just got is exactly right - don't diminish it by suggesting that you think at least part of what you did is Ok because your personal bar is lower.
Since you mentioned a couple names that can sing, let me just re-emphasize what [MENTION=45867]VomitHatSteve[/MENTION] said, and that's work on your singing. You have to sing in tune, and even if you don't want to belt it out, but use a restrained delivery, if you expect people to listen to the words, it's got to be in tune, or a lot closer than that. If you can't hear the difference between what you are doing and those two did, get a vocal coach.
No, the guitar is not in tune. If the intonation is out, it cannot be in tune. If you have a tuner, and I assume you do, since you say it's in tune, play those chords and check the intonation of the individual chord notes. Get them a helluva lot closer than they are in that recording.
You could make the words more intelligible with some EQ on the vocal track, assuming it's been done with a separate mic. A high-pass filter (HPF) might be enough to get past the woof but you can try other cuts in the lower-mids and see what helps best.