Hi, I've moved the posts from your other thread (in the Cardiff forum) over to this one. It's best if everything is kept in one thread, I think. The law forum is probably better as you can get views from law students across the country (and even some who have already entered the profession).
As a good guide, any redbrick (Manchester, Liverpool, Sheffield etc.) or "big city" uni (Newcastle, Nottingham, Cardiff, Glasgow etc.) will be of at least a "good" and solid standard and will be resepected. This is true of Cardiff.
As a guide, see this sticky
http://www.thestudentroom.co.uk/showthread.php?t=88536 As you can see here, the general consensous is that universities who are
Oxford, Cambridge
(medium gap)
Durham, UCL, KCL, LSE, Bristol, Nottingham (Notts a strange one, not as traditional as the others, I'd say it's more popular in the city firms than the bar).
(small to medium gap)
Manchester, Warwick, Birmingham, Exeter, Leicester and possibly Newcastle (although I wouldn't place Newcastle as significantly above the other big city unis and redbricks).
After this, the difference is negligible, certainly amongst the traditional universities. Cardiff is, in my opinion, more than a match for Sheffield, Liverpool, Reading etc.
These groups are only of any real concern at the bar or city, not so much regional/provincial/high street firms. Here your uni "brand" would be as significant.
I don't know Cardiff's exact links with firms, but in my opinion you'll have very good prospects with the high street and regional firms (providing you get at least a 2:1 and have experience, of course. Your chances at the city are still reasonable with a top degree.
Hopefully some students will be able to give you specific information on the university's links. This possibly isn't my greatest post as I'm a little rushed. I'll try and be back later.