Actually, considering I actually have those variants, (and the later ones by...who was it again?), plus the regular covers....yeah, I'm probably not the guy to make that argument.
I like the one where she's knee deep in lava. Had absolutely nothing to do with the story inside, but it sure looked dramatic. But my favorite was the stock cover they used for #27. The foreshortening was a bit wonky, but apart from that, it was great. Then, now that I'm on about cover, the best PG cover was actually in the horrible nu52, the one where she's facing the huge Darkseid, back to the viewer and dwarfed by him. A nice peril cover.
The point about PG I'm trying to make is that she CAN be great, in the right hands with the right plan. DC should make that happen. When she's constantly published, she does tend to have quite a few fans IMO, enough to make it worth DC's effort to please, especially considering all the entirely new characters they're making big bets on.