SAO was pretty terrible, but there are plenty of worse things out there. Probably the worst thing I've ever seen was Chaos Dragon: Sekiryuu Seneki. I watched it as it aired during the Summer 2015 season. It was torturous to watch.
Edit: those of you who actually enjoy SAO need to watch something good. Yes, the first half of the first season wasn't all that bad, but everything after is complete trash.
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I didn't like The Asterisk War. It jumped straight into an OP protagonist main. Not only is he OP, he's a harem magnet (big surprise) who only lolis are attracted to (except for one out of the 3 or 4). He immediately challenges and beats the strongest girl in the school (who is added to the harem) and becomes the strongest- all this while [u]he doesn't even know how to efficiently utilize his power[/u]. The season ends with him beating another girl in a lame duel. Don't watch.