GX is not shit. The first two seasons were pretty godawful I'll admit, but season 3 was amazing, and while it did get a bit too close to "CARD GAMES TO SAVE THE WORLD" territory, it actually managed to convincingly justify it.
Season 4, however, is a really mixed bag. It seems like they made it purely for the sake of wrapping up loose ends and rushing towards an end so they could get to 5D's. Judai vs. Yugi was fucking awesome, though.
As for 5D's, I just hope that the riding actually has an influence on the dueling and isn't just a shitty gimmick, 'cause I kinda like the D-Wheel's design.