SAO is fine, not terrible. Not great either. There's just a bunch of haters in this thread.
Speaking about that, let's go over the theory that there's more bad Gundam than G(ood) Gundam. I've seen every show/OVA besides Reconguista and Unicron.
MSG - Good. A bit villain of the day and old, but watchable.
Zeta - Good. Not as great as some claim and toyetic as hell, but redeems itself in the end.
ZZ - Good. Weird, but good. Saved by Judau's amazing voice acting. Might be the progenitor of all anime sister-con shows.
Victory - Bad. A lot of great ideas with some bad execution.
0083 - Bad. The original in the so pretty to look at but terrible story OVAs.
Char's Counterattack - Bad. The second in the pretty graphics, awful story series.
G Gundam - Good. Some of the best Gundam has to offer. The fact that it is a Super Robot Tournament fighter that has better characterization and political intrigue than the real Gundam puts the rest of the series on blast. The show with Robot Gladiatorial games for control of the earth sphere does the war is hell, humanity sucks and needs to do better message better than the rest of the series combined.
Wing - Good. A lot of great ideas but this one starts the trend of even Alternate reality tales just being thinly veiled pastiches of the UC formula.
0080 - Good. Like G Gundam before it merely calling this OVA good is severely understating just how great this is, but I'm going on simple pass/fail.
Gundam X - Good. This is the one borderline show I give a good to. It's an interesting what if story of the UC in which everything goes to hell.
08th MS - Good. The only member of the great animation awful story trilogy to get a pass because its one truly amazing moment is, well, frankly, truly amazing.
Turn A - Good. Happy Tomino. This has all the crazy characters doing bananas things but at least it is doing something different with another happy go lucky protagonist and some truly bizarre but beautiful going ons. Falls apart near the end but style and presentation give it a passing mark.
SEED - Good. The mass market Gundam hit that revitalized the franchise. Yet another retelling of the basic UC plot but this time with extra sex and romance and a lot of Jpop. Very good series at doing the end of episode transition into the ending in fact this and its sequel are masters at cliffhangers.
SEED DESTINY - Bad. I love this show, but it is bad. I think people should watch it (and SEED) probably the ultimate group watch bad Gundam show.
00 - Good. Great series capitalizing on the success of Code Geass/Death Note in that it follows a group of well intentioned villains trying to force peace upon the earth.
00 Season 2 - BAD. Takes everything good about 00 and throws it in the toilet.
AGE - BAD. Just as awful as 00 Season 2.
Gundam Build Fighters - Good. Another Toyetic kids show like G Gundam that somehow puts the rest of the series on blast.
Gundam Build Fighters Try - Good. Nowhere near as good as GBF but certainly good enough to get the pass.
IBO -...I don't know. I want to watch the second season. I'm leaning towards bad though.
13-6. If I consider 00 one product then it would be 12-6 because 00 Season 2 is that bad. If I switch X and give IBO the grade I'd give season one it would be 11-8. I'd also probably hate Reconguista and give it a fail, making my most cynical viewing 11-9, close enough to 50/50, which is about right.
When Gundam is Good, it's Great. When it's bad, it can also be pretty great. When it's awful it is boring. Some people take it too seriously (The only great serious Gundam is the one that stars a little school boy rooting for the underdog) but that's part of the fun.