I'm not talking about underachieving/failed attractions, but about placement of attractions, layout of lands, space, etc. At WDW, they have so much land, everything is spread out, but at Disneyland, land is a premium and they have to be uber-creative in fitting things in.
I personally wish they had placed POTC/NOS farther north so that Adventureland had more space. POTC ties in well with adventure, of course, but there is NO space for anything more in Adventureland. The queue for Indy *barely* even fits. There literally can never be another attraction in that land unless they bridge over it or have a queue on the Main Street side of Jungle cruise. Which is too bad, because Adventureland has so many possibilities.