DrogueLeague tables are not a good way to make your decision. There are many reasons not to do law at Oxford, mainly because it's a traditional, 'black letter' course, and there are more progressive, modern courses offered elsewhere. For example most universities don't have compulsory Roman law (that I'm aware of?). However quality is not one of those reasons.
Moreover, law as a profession is notoriously snooty and prestige-orientated. Getting a pupilage at a barristers chambers is very difficult if your degree isn't Oxbridge, or perhaps LSE. Oxford students find getting into law careers much, much easier. I've known quite a few people with firsts from pretty good universities struggle to get placements where they want, and only know one who got a pupilage, yet all my Oxford friends, even those who did History and wanted to do conversion courses, found it much easier.
Now look at league tables. What are their basis for comparison? Teaching quality I can understand, though the TQA have said many times that the 6 scores out of 4 should not be added up, as they're designed to be tested against specific criteria and dropping a point on one may be more than made up by being vastly above a 4 on another, yet that isn't represented in an overall score. Research quality is a bit iffy to be used, since it really has little bearing. New entrants' grades is quite useful, though only for peer group/prestige reasons, rather than the course. Lastly comes the strange "graduate destinations", which gives amazingly stupid results since rather menial jobs count, whereas various further study things don't. To differentiate, employment-wise, between top universities you need to look at where the grads get into, not just whether they get a job.
Oxford law isn't for everyone, but that'e because of style, not quality. Some league table having it 5th has no bearing on anything, really. League tables aren't designed to test between the top few, they're designed to test between the majority, the 50 or 60 universities near the middle, and even that they're not brilliant at.