I did 5 A2's and came out with AAABC (the C was in General Studies) and I managed pretty well. I think how well you cope depends on your aptitude for your chosen subjects, for example if I'd have done maths/sciences I would NEVER have got those grades, but with 5 essay and arts type subjects I didn't find it too difficult because I'm naturally better at that style of subject. Although uni's only usually give you an offer of 3 grades it does give you more chance at hitting those grades because obviously, you have 5 chances (or 4 in my case ex. General St) to hit them.