I think we got the point here. Garage is an amateur who just plays rock n roll from his heart and the result is just what comes.
Gunther Toody said:
"I don't know about garage but I know what I like,
surfin' in the swamp on a saturday night."
Paraphrased from Lux Interior.
Garage is a bunch of musical neophyte nerds doing their best to sound like the Stones or the Kinks or the Yardbirds (or fill in the blanks with any band that gets poonanny, which is the biggest motivator to start a band) but not quite getting there, yet the result is honest and full of piss, energy and vitriol.