One of the game's most well-respected commentators Tim Lane used his weekly column in The Sunday Age in Melbourne to slam the introduction of GWS and Gold Coast into the league.
The Giants made their AFL debut last season, winning two games and finishing last, a year after the young Suns made a similar first step into the league.
Labelling the two newcomers "catastrophes", Lane declared the franchises would cost the AFL millions of dollars, "without reaping a dividend".
But, Sheedy defended his Blacktown-based club on Friday in a response on the Giants' official website.
Sheedy reckons he's seen nothing but growth in Australian Rules in the western Sydney region, where he is leading the pioneering charge in an often hostile rugby league-established area.
Sheedy, legendary for his forward-thinking and ground-breaking attitudes and ideas in the game, also lashed Lane's suggestion that the Suns and Giants were a pair of "unloved, artificially formed clubs".
"Try telling that to our nearly 11,000 members (and growing)," Sheedy wrote.
"Try telling that to the fans who track across Sydney from the Blue Mountains and beyond to watch our games.
"That is a football club. It is not a catastrophe."
Sheedy took a light-hearted jab at new Carlton coach, "Grumpy" Mick Malthouse, declaring people "down south" were getting more disillusioned the more the game grows in the north.
"I don’t know if you have been hanging out with your new coach Grumpy Mick but I reckon you could easily become the eighth dwarf - Sad," Sheedy continued.
"As crowds, membership, TV ratings and participation grows here in Sydney, so it seems does the disillusionment of people like yourself down south.
"Bleating about cost of living allowances and draft picks. Rotations and rules."
Sheedy, who coached Melbourne-based club Essendon to premierships in 1993 and 2000, says he has seen nothing but positive signs since his foray into the league-dominated west of Sydney.
"I am encouraged by what I see around me. Kids playing AFL on what were once rugby and soccer fields across Sydney," he said.
"Goalposts going up around Western Sydney. Bet you didn't know the participation rate in our game increased by 27 per cent last year in Western Sydney did you?
"Enjoy the game Tim.
"And please keep it in perspective."