By what measure does it have bloat, and how does that relate to other anti-virus applications?
I can sort of field this one. While it's nowhere near the worst out there, in my experience it typically consumes in around 30-50MB of RAM while running, which is higher than the ~15MB for Norton 2009 (which I'm fairly sure remains in 2010), and much higher than the <10MB for Avast (usually hovers around 6MB; Right now, combined, Avast's two services are taking up just over 5MB of RAM on my machine with resident shield enabled).
AVG's been becoming less and less efficient with its use of memory and CPU time since it made the transition from 7.5 to 8.0. Still well within tolerance, however; We still used it at the shop and it still performed fairly well. 9.0 hit and there were some fairly hefty issues with the transition; One very important issue in the business world is the Exchange/Outlook plugin not being upgraded properly, and remaining at the old 8.5 version. The plugin fails to launch, Outlook/Exchange crashes on load, and a complete removal via the removal tool and fresh reinstall is necessary to fix it. Another, less serious issue was focus-stealing every 30 minutes, including to the point of knocking you out of a full-screen app. Annoying. But particularly annoying and the major reason why I won't use AVG in the future was that the devs were very lax in actually acknowledging and fixing these rather obvious bugs.
And here's where it comes into personal experience, and where Your Mileage May Vary(TM): I've just found the scanner to be slower than Avast's. Running AVG caused a rather noticeable drop in general system performance on my computer versus running without, which is very neatly addressed by Avast. Until I finally decided to give Avast a go again, I'd been uninstalling and installing AVG off and on for several months, feeling the need to have some kind of realtime protection while at the same time not appreciating the decline in performance.
Anyway, as for the rest of it, I dunno. In terms of features, AVG is pretty average. I wouldn't be able to tell you with regard to detection rates. The new Avast hasn't been properly benchmarked as of yet and does contain extra features in that regard, including a new Behavior scanner, so that's a little up in the air.