Board Thread:General Discussion/@comment-4436775-20130713014204/@comment-1824272-20130727164101

Not that they're bad. Just that they're the exact same. You need to follow this one set path that's the exact same every time you do the mission, with the same turns and everything. If you do not follow it, the mission is in failure.

I'm fine with canyon/tunnel flights and I'm fine with ERS because they're the exact same system. It does require some skill to keep to the path. The canyons are a step above tunnels and ERS because of the various hills and valleys within them (w/o even mentioning the bridges in AC2, ACJA, and ACAHL), and ERS does have the annoying pull-the-plane-into-the-path problem, but otherwise they're the same system.