First off, thinking you are "too good" for a university before you even have full A-Levels is a dangerous game to play.
Secondly, QM cannot be said to not be a good university for Law. I see it as the place where people kicked into gear in their AS year rather than their GCSE year head off, don't know why, just do.
As for rankings of universities, you probably won't get better than "Lawz's" ranking a few years back. IIRC, it went something like:
Oxford
Cambridge
LSE
UCL
KCL
Durham
Nottingham
Bristol
Warwick
Manchester
Exeter
QMUL
ect
That's how I remember it anyway. I'd personally swap with Manchester with QMUL though. Those who go to LSE will assert they're in their own little tier, but they're not, and UCL certainly is not in it's own (tiers have equal worth, i.e. UCL=Nottingham.) A first from Nottingham would be viewed better than a 2:1 from LSE for example. Now, clearly, things aren't quite as black and white as that, but I'd recommend trying to find the thread I'm talking of. QMUL is mentioned on the second page.
I should add so that you can appreciate my comments in context, that I have an offer from QMUL. An offer I'm unsure I would take if all my other choices reject me in favour of York. I have heard that some firms take the overall prestige of a place to be a more reliable qualifier than how well a department is viewed for Law (which may well explain QMUL's curious predicament.)
EDIT: Not the reason I'd think of going to York instead though, I want to be a barrister.