The thing I like about bridge cameras is you don't need to change lenses. From 0mm super macro, 28mm wide angle to 560mm tele - its all in a package weighing about half kilo. Higher ISO (1600) performance is a lot better than two years ago. Add to that HD movie with CD quality stereo sound and sub R4000 price tags and the ability to change lenses and get dust on your sensor is not looking as attractive anymore.
ISO1600? Do you have an example of a photo at ISO1600?
AFAIK, you can't even compare a bridge vs SLR when it comes to noise and higher ISO figures. The SLR is in a league of it's own.
In a sentence, a bridge camera is Jack of All trades and Master of none. Yes, from super macro to 28mm wide to 560mm tele ... but a SLR with dedicated lens for each function just does it better, sharper, clearer. Anything bought 'dedicated' is alot better than something that can do it it one box. Look at hi-fis. Even media streamers (PS3 vs a decent media streamer)
A bridge camera min apperture is F8 which means I can't do the some of the shots I'd like to attempt with it. So your range is F2.8-F8 - and that's it. Forever
Blurring the background is, again, reasonably difficult with a bridge and small sensor :/
I've realised even with 'full manual' there is one thing it can't do either ; you can't manual shutter speed beyond 1 sec and manual aperture. Shutter speed goes to 15 seconds - but from 1-14 seconds you get an auto aperture (IIRC) ... which makes some shots impossible
Make no mistake - I'm a fan of the bridge, but it does lack ...