A queue line should be more than just somewhere where people just move around a small long pathway merely waiting for a ride. It should be at least one of the following:
1/ a place to bring people in to a story or setting. Examples, Duel, Hex,Oblivion,
2/ showcase and build up different elements of a ride. Examples, Nemesis, Colossus & Black Mamba
3/ Bring you through different themed rooms & settings (slightly similar to 1). Examples, Maus Au chocolate, Tower Of Terror & Dragon
A cattle pen is only acceptable if:
1/ it is the extended queue line and is only used on very busy days I.E space Mountain mission 2
2/ The ride has a high throughput I.E Ratatouiee
3/ the park isn't a leading park I.E Oakwood & Lightwater Valley
Ok, a cattle pen is the easiest & cheapest option for a ride queue, but it isn't generally nice to queue in especially on a hot busy day with disruptive crowds and the like. Unfortunately, most of Merlin's new rides seem to have cattle pen queues and only a few of them actually work, Smilers only does because you have the excitement of interacting with the ride above you & Atlantis because there's a short but immersive queue indoors (and it's generally good at throughputs).
Saw for me is generally the worst to queue in (but maybe that's supposed to be duty its torture theme).