On more casual conversation, looking at the original game makes me realize how simplistic the first one was in terms of map making. The first SC really had no in-map cutscenes, the closest thing to one is the end of Terran 9, most of the "cutscenes" have units appear and the game pause as speech rolls. Really, vanilla Starcraft is boring from a technical standpoint.
Brood War? Hell, the Escape From Aiur alone has small-scale battles throughout the map as you find wandering zealots. Then you ramp things up to Aldaris' death, the entirety of Emperor's Fall with the ghosts and battlecruisers and Mengsk's escape with Raynor, Emperor's Flight with the opening Valkyrie raid, Raynor attacking the psi disruptor generators. It's like the developers realized "hey, we can do cool shit in-game!" when it slipped their minds in the first game.