I was a Les Mis DIEHARD a few years ago...I've tapered off a bit since, but I still love the musical, of course. I didn't even know they'd made a 25th Anniversary Concert special until one of my sisters mentioned that it was going to be on last night (the main appeal of seeing it was Nick Jonas, apparently. :p ). So of course I had to watch it; I mean, it's Les Miserables!
I didn't read up on the casting at all before hand, so aside from Nick, I didn't know who'd be playing who. So I will say that during the entire show, it was one happy scream after happy scream. LEA SALGONA! JENNY GALLOWAY! MATT LUCAS! SAMANTHA WHATSHERNAME! (lol...I don't know her name, but she was on that ALW show "I'd Do Anything" a few years ago, and I'd always loved her singing...so exciting to see her as Eponine).
Nick Jonas was definitely the weakest link of the cast...such a shame too, because I think he has a good voice. Pop singing gave him a lot of bad habits, I think. Did you know he started out on Broadway when he was a kid...played Gavroche at some point or another, actually. Musical theater singing is definitely a far cry from pop singing though. It definitely showed when he sang alongside some of the top musical performers in the industry. I didn't think his "Empty Chairs" was bad; my ears didn't bleed so that's good.

But he definitely has a LONG way to go if he wants to make a career out of musical theater.
I'll probably be buying the CD and/or the DVD later on...definitely one to keep in my collection.