The only Sondheim show I've ever felt bored during was Sunday in the Park With George. I really wanted to like it, but for some reason I just couldn't get into the story. Just not my cup of tea I guess.
I'd take a boring Sondheim show over some of the crap on Broadway right now anyday. Sondheim's worst is better than most people's best. Agreed! Even if I felt it was boring, Sunday In The Park With George is much better than a lot of what is on Broadway right now, so I'm not complaining.
As for Passion, I really adored it. I don't think it's boring, I think it is just a slow paced show. Some people dislike that, but I'm not one of them.
There wouldn't be lights bright enough!