from the webmaster who wants to be the next Nikki Finke but should be on More To Love said:
Generally speaking, in both Japan and the US, you don't talk smack about your employers, and that's multiply true when your business is entertainment. When a movie project goes really bad, later on the actors may sheepishly make a few comments, but usually they're few and far between.
But Aya Hirano, the popular seiyuu/would-be singer/would-be model behind the voice of Haruhi in The Melancholy of Haruhi Suzumiya, has few such qualms. Sankaku Complex links to an appearance Hirano made-- though I don't think the quote in the headline is a potentially misleading translatin. What she actually says is "yatteru hou yori miteru hou ga taihen da na to omoinagara..." which is roughly that she thinks that watching it was worse (tougher, harsher, or if you prefer, more awful) than making it.
She goes on to talk about the pressure of having to record the same episode eight times. (Remember, they re-animated each episode, so it would need to be re-recorded every time, not just the few changes.)
Hirano also notes that all of the cast was mystified when they heard they'd be doing the same episode, and that it was especially tough for Tomokazu Sugita, who plays Kyon, because he had some ad-lib moments.
She also thanks fans who stuck with the show past Endless Eight and says that it's nice to have escaped the arc.