Whenever I hear people bitch and moan about how terrible the artwork was on the original ponies, all I can do is roll my eyes and write them off as a kid. The original artwork for the ponies, is NOT terrible for the time it was being made. Go look at any 80's cartoon-Care Bears, He-Man, Jem, and you'll see that this was just the art style of the days, what was common, expected and able to be done. It doesn't make it terrible. It makes it fitting for the times. Just as I also roll my eyes when people say the old MLP was too girly and childish...right, because devilish centaurs, youth-sucking witches and heartless rock dogs that turn living things into stone are SO much girlier and innocent than baby-sitting adventures, fashion show mishaps and Valentine Day love troubles (*ahem* all episodes from FiM). Get over yourselves bronies, FiM may have some awesome badassery, but don't pretend that a majority of the episodes aren't actually still aimed for a toddler audience and the animation isn't just like every other simplistic flat cartoon out there.
Edit: And to those who keep quoting My Little Pony Tales as G2...stop. Just stop. There was no G2 cartoon, only a couple video games and a toy line that didn't do too particularly well because the pony design was so different from the previous style. MLPT is still G1.