I personally like the bigger look from CR. It makes the action more believable.
However, it makes sense that we wouldn't be as muscled. In SAS they would spend months building up for a deployment. As a Double-Oh it seems he would be "in the field" almost constantly, and you can't exactly go to a gym every day.
Although now that I think about it, wasn't Bond supposed to be MI6 for a while before CR anyway? SAS would have been a while ago.
Yeah, Craig's look in CR was really that of a semi-professional bodybuilder who trained with a lot of "help". That famous scene of him emerging from the sea is good to look at and won him many fans, and I do appreciate that it's a Bond flick and thus escapist fantasy rather than gritty documentary or something, but he does look ridiculously over-pumped-up. He looks like the kind of guy who refuses to climb a flight of stairs because he's worried that it'd count as excessive cardio, which is hardly believable for a Double-O (or indeed for anyone who wasn't a seriously dedicated bodybuilder).
Has Daniel Craig "slimmed" down TOO much for QoS?

Biceps seem to be verging on the disproportionally large, and the abs definition could be better. Perhaps he needs to slim down MORE?
Agree 100%.
The lets bulk up Dan campaign by Craig and EON for CR was a brilliant concept and worked superbly in the marketing of Craig as Bond.
As a marketing idea - you replace an astonshingly good-looking, tall though slightly-built man with a short, blond man with, er, rugged looks - by emphasising Craig's "strengths" was a great coup.
Sadly, I think it went too far. James Bond should, in my opinion, never be as bulky as Craig became. Glad that QOS seems to have addressed that.
Oh, and Loom, do you know how many Craig fanboys you are going to anger by suggesting that he might have had "help" from 'roids...