#2
Well, you said it, it's pretty bad. Timing is off a LOT, lots of wrong notes/chords and sloppy playing overall but sure, if you think they're that easily impressed I guess there is no need for further improvement.
#4
One word, Metronome.

Buy one and work on your timing. Its bad and I cant really hear the leads.
#5
the two parts seemed out of synch
not sure if thats a recording error but record it again and fix the synch error or stay on time
use a metronome to keep everthing tidy and on time