Finally got around to watching The Melancholy of Haruhi Suzumiya's "second season" (which is just 14 new episodes interspersed in-between a rebroadcast first season), and man does it suck. I've always been rather lukewarm on Haruhi, appreciating it's mildly sarcastic tone and occasional moment of wonder, but never understanding why that show of all shows would gather such ridiculous hype. But this "second season" takes whatever I enjoyed about the show and flushes it down the toilet. The season is composed of one dull standalone episode and 2 arcs, one 8 episodes long and one 5 episodes long.
The 8-episode "Endless Eight" arc is legendary for its high magnitude of awfulness, being so terrible that it probably single-handedly destroyed the franchise, causing the production staff and voice actors to have to publicly apologize for it. To make a ridiculously long story short, "Endless Eight" has the characters stuck in a 2-week time loop where they forget everything at the end of the loop. Every episode has the same scenes and the same dialogue. And this crap goes on for 8 episodes, with an especially lame conclusion. Yeah...
As for the other arc, it just details the making of the intentionally crappy "Episode 0" fan movie from the first season. It's not terrible, just stretched out way too long and ruined by long scenes of dull exposition that ruin any potential humor. This was a problem I had with the original season as well, but the issue's so much more pronounced here.