I guess you guys don't experience this often, being at lvl 30, but around my level, people seem to be confused/downright angry when I say I'm jungling. One person asked me if I was midding in one game. In another, they made me mid instead when we had both Teemo and Ashe IN THE SAME LANE. And in yet another game, top and bot were bitching at me from the 1:30 mark, while I was asking someone to leash blue for me. And when I tried to explain that getting my champ off the ground early without jungling (Amumu) would be a bit difficult, they asked me why I use him then.
Idk, it's starting to annoy me a lot, since my main group of champs atm are ww/Rammus/Amumu (and Sona once I buy her, since people seem to love it when I use her), and I can't jungle right when everyone complains. In only one game I've played has someone offered to leash for me. I was blown away by that, since most people ignore me when I ask for a leash (since my runes suck, I get super close to dying when going for blue at lvl 1).
Also, I like your Amumu guide, Jebus. It's definitely more in-depth than the others, that's for sure.