Offers are not always a reflection on the uni's overall standard.
When I applied (so for a 2004 start), applicants for straight English at Exeter were offered AAA.
Applicants for joint hons (English and French, English and Film, English with a year in America, English and Classics etc) were given lower offers. Mine was BBB. Does this somehow 'worsen' the uni or mean the course is less rigorous? Of course not. They still have quotas for every course, and they still have to fill them, and if they have to fill them by lowering the offer, then so be it. It's mostly about bums on seats. There are usually fewer applicants to joint hons courses - it's a fact of life, and doesn't mean much in the wider scheme of things.
So take care to think beyond the frame of mind of 'oh, it's a lower offer, it must be a worse uni'. While this *may* be the case, it's not the only conclusion to draw. Think about all the reasons *why* the offer might be lower.