Nemesis' is by far the best.
The Smiler's pit has some drainage issues and is thus unbearable in the rain, or when rain has passed. However, it's still quite fun to watch the cars speed around so close to you.
Th13teen's needs a bit of work done.
Air/Galactica's is quite good now they've brought the screens in and updated the music.
Rita's is pretty bad, it's very boring.
Oblivion is probably the worst as it seems to have been forgotten in terms of the rest of the resort, it's just kind of deteriorating and is in need to quite a hefty refurb, at least in my opinion.
Oblivion - far too long. Seems to be about a 10 minute walk to get back to where you started (unless you go through single rider and switch lines, but that would be queue jumping )
I agree, It's also too long to walk through, like it may say there's "0 wait time" but you still have to walk quite a way just to get to the station.
The shop's nice though, even better if it was open.