Well I did marathon all of One Piece because some friends made me, and it surprisingly wasn't bad like I thought it would be.
I'll just do everything I can to make up for lost time in the gundam universe ~
Some of them require moods.
0079 is easy to marathon, if you can deal with QUALITY.
The Zeta and ZZ sequels are hit or miss, so take them in pieces.
G Gundam is watchable any time and any point in your life. Expect smiles.
Seed takes A LOT of work to get through. Anything from Seed does.
Wing is for yaoi girls but the action is bretty gud.
Don't watch Unicorn until it's over.
Uhh I guess there is 00, but watch 0079 first to get some of the references.
OH. War in a Pocket is a short series but it's really fucking sad and brutal. 0083, to me, feels like a worthy sequel to the first series even if it isn't. And watch 08th Team straight through. Not like you'll need help with that.
Edit: On topic, good to know Da Qiao has it. I think I remember it in 7 now that you say that, but I don't remember it being so damn easy.
I'd love to play the older games again but my emulation isn't up to par, and I want the quick loading times not found in the PS2 versions. You spoil me, PS3.