What's your take on the sub par performances? I can put it down to 4 things. Live sound, not sticking to original tempos, lack of third guitar and lackluster performance. I think 2 and 3 are chiefly to blame. If they played original tempos and had rhythm guitar that was layered on the record but wasn't available live, it would automatically sound twice as better.
CSiT after the intro, like Aces High, blasts directly into a guitar harmony. But it doesn't work live without the guitar galloping behind it. Sure I never saw it live and I can't tell that Harris bass sound didn't fill up the venue with decibels but it's not something you can experience without the mega loud setting.
Dickinson did praise Stranger a few times. Remember those SiT release interviews where he breaks down the songs. He would spend just a line or two for songs like CSiT, SoM, Alex, but he would talk more detail about WY and Stranger. Also remarked that SIASL is Purplesque. Unless he was explicitly advertising the album singles I'd say he likes those songs and doesn't like the rest of the album much.