Oddly enough the worst stalls seat I've ever had at The Bridgewater was on the front row (Ute Lemper, a few years ago). It was a sit down affair (I don't think they take too well to standing), and I was very tempted to find a spare seat towards the back of the hall, after the interval. Some did I recall!
The worst seats (personally speaking), are the single rows at the side of the circles. I don't like heights that much, and sat feeling very faint through the Hague Phillharmonic about 2 nights after Ute. To get to your seat was awful, as the rail is low, and I'm tall (squeezing past people). I didn't feel well that night!
Because of the odd shapes of the circle, some seats up there are a bit limited - you can see the stage, just not any of the audience. Alright I suppose, but occasionally I felt like I was watching the gig on dvd or something, rather than being there.
If you have a stall seat though, you should be fine.
