hmm, I don't get it then...
like taking up too much space in the mix? meaning they sound big by themselves but the rest is sounding too small? or frequency-wise?
Like, could you explain a lil bit more, it's highly appreciated
I mean frequency-wise.
I'm almost a noob so i could not explain you correctly what i mean by "air". I could try but i'm gonna sound like a dick so i'll let the "sound wizards" of this forum do it
Please someone correct me if i wrong but air has something to do with the high frenquencies, and air is a characteristic of the sound you get from a miked amplifier. The more distant your mic is from the cab, the more air you'll have (am i right ? ).
When you use a cab sim "air" is part of it.When you use a direct out from an amp there's no air.
So a good guitar sound has air, but it's like everything :if you have no air it sucks,if you have too much it sucks
Some people like a sound with a lot of air and like the way it sound in a mix, some other people like me don't like when there is a lot of air.
The noobiness here is that i tend to think too much presence and too much air sound the same

I have a hard time to hear/understand/explain the difference actually even if i can hear one (a lot of presence is ok, whereas a lot of air is very ugly to me).
Anyway for me examples of guitars with too much air and/or presence are the guitar sound on those :
http://www.myspace.com/deathbeforedishonorbhc (clips from the "666 friends family forever united "ep (not sure about the exact name) and the "count me in" album) (i like this band but the guitars sound too much like the sound i get with my KORG AX1500G amp+cab sim with too much air (and presence) )
http://www.myspace.com/eyeless (i love this band but i'mnot a huge fan of the guitar sound on the last album)
So typically what i don't like is a 5150 sound with tons of air and/or presence which gives a yet modern but very "processed" sounding guitar sound. Same feeling when i hear most of the POD guitar sounds people get on this forum, which are ok for Meshuggah-ish stuff but would sound weird for hardcore for instance IMO.