Made it to the 3rd world (great opening commentary for that first Castle level, by the way) and...I can't believe it took me this long to realize Jack uses Tank Controls.
That lack of a highlight or indicator on or above objects you can interact with has slowly shifted from an unfortunate oversight to a major annoyance, especially now that enemies are a lot more plentiful and harder to kill off.
We must have very different definitions of what "tank controls" are. A tank moves forward and backward easy enough, but it slowly turns (think RE4). You press a direction with the analog stick and Jack goes that way, no slow turning involved (think any 3d mario). The problem is that the camera doesn't follow you unless you manually tell it to do so.
The highlight indicator would help, but I wonder if it was more of an aesthetic choice. Outside of blood being red and sounds words (onomatopoeia) being yellow, MadWorld is black and white. I guess they didn't want colors strewn throughout the levels. I file that as being a sacrifice. Gameplay somewhat suffers for visuals.
Well, often throughout the game it seemed like whenever I wanted to turn around and nail a guy right behind me (usually while I was carrying a sign or whatnot to use on him), Jack would back up and turn like a Tank instead of actually turning around. But it looks like most of that was just the camera influencing my recollections, because he does turn around on a dime when you want him to .
Incidentally, I just beat the game. That last boss was pretty hard, actually, though I just breezed through the Tower this time now that I knew to just throw the damn Ninjas into the fans. I ended up hitting the cheap shot boss right into the fans with one of them, so that ended up being an easy kill.
EDIT: Alright, now THAT'S how you do an End Credits sequence. That's easily one of the funniest things I've seen/heard in gaming in years.