Am I the only one who doesn't see a problem here? I actually like this bag ALOT. Especially since you're looking for a bag to carry laptop & tons of other stuff around. You aren't really looking for a *small* bag.
I'll confess though. I own 3 bags like this one here and I use them similarly. I also use them for traveling (can fit in so much) and sometimes for street shopping where I'm gonna buy little knick knacks and can just stuff them all in my bag. In summer, I'll even use it for a movie/lunch outing Coz I can comfortably stuff a lightweight shrug inside.
Like you, I'm most comfortable with medium sized structured handbags. But this size *has* it's own merits. Just my opinion, though. Put in your own stuff and see how large & heavy the bag feels then.