I really like BBC News' presentation in general. News 24's graphics are by far the best news channel graphics I've seen. They are neat, not too obtrusive, and look stylish and professional. I also really like the way they animate and adapt to the information being displayed (usually) really well. However, the national news graphics, whilst fulfilling their purpose quite adequately, do look quite out of date now. News 24 graphics could so easily be adapted for the national news. The News 24 set, I think, is really good for the amount of space available, although I do feel they missed a trick in not incorporating a larger screen into the right hand stand-up area. They also could make more use of screens in the newsroom - something like this mock I did a while ago:
http://www.rp-networkservices.com/tvforum/uploads/bbcn24_idea4.gif
Sky News' graphics aren't so bad, but I do find they generally obstruct much of the picture, can be too "in your face", and the blue bar, when not being used as a ticker, is completely pointless clutter. Before News 24's relaunch I would have said Sky had the best graphics, but now the BBC has steamrollered ahead in my opinion. I've got no problems with the Sky News studio - nothing spectacular, but it works.
ITV News' graphics are dire in my opinion. Not only do I find the colours cold and unwelcoming, but the way everything is laid out is poorly implemented (compared to Sky's, which are basically the same idea). I think ITV has the least professional-looking graphics. I've never been particularly keen on the "Theatre of News", either. From some angles it can look great, from some of the close-up angles it can look painfully cheap (anyone who saw an ITV News Update on ITV1 this morning would know what I mean). Although it must have seemed like a great idea to use such a large CSO, I just don't think the end-product is spectacular enough to justify all the effort.
So in all, BBC News is miles in front with in presentation terms, Sky in second place, with ITV lagging way behind.