I'm not sure what's worse, people attacking people, attacking the DLC, or people just attacking the DLC.
For the former, they have the right to complain, remember back in November 2011*? We were all expecting DLC every 2 months, whether that meant 8 weeks or 60-70 days, we had a ballpark in mind. Now we've had 3 Car Packs, and its been 10 months. They have a right to want more DLC, and be dissappointed that this DLC is basically nothing but new skins.
For the latter, we're (sort of) lucky they aren't just dropping GT5 right now and devoting their small company 100% onto GT6, with the amount of time GT5 took to make, GT6 could be as long, or longer, so the fact we're getting anything means hopefully by November/December-ish time, we may be up for as many as 8 new cars and a couple of tracks, and a few of those 8 cars might even be unique. So I say, fingers crossed, don't like it don't buy it, its a slight shame that a heap of us, myself included, won't pay money for these cars, but ultimately it won't make the game any worse for us, and for those who do, they get a BRZ skin for their FT-86, and maybe the suspension tune and gear ratio differences as well.
*
https://www.gtplanet.net/new-gran-turismo-5-dlc-approximately-every-two-months/