Actually, going back to replay SR2 is a taller order than I could possibly have imagined. The controls are pretty naff compared. Awkwardly clicking the right stick to toggle your - incidentally quite sluggish - aim and snapping between three set movement speeds is only the beginning, but somehow probably the most damning. It's funny because back when it came out its controls was one of its most significant steps up over every other GTA derived open world game.
It does have a vastly more coherent narrative that manages quite a few memorable and surprisingly subtle story beats and characterisations, and in terms of sheer content it feels fuller. That's not to say I necessarily ended up spending more TIME with 2 than 3, I think in that regard - and especially if you pursue a second playthrough for the branching bits for 3 - they are quite level, ultimately.
But Saints Row 3 gets the important stuff right, and viewed purely as a video game it is astonishingly successful. It plays considerably better than its predecessors, happily stomping into genuinely great action/shooter territory, has zero mind numbing filler stuff (which parts of 2 definitely amount to) and haphazard storytelling notwithstanding has a wholly satisfying structure, gameplay progression/arc and a brilliant finish.
The reasons for why you'd play Saints Row in addition to/instead of GTA are here in fullest effect, and the things 2 did better essentially overlap with GTA's appeal. If you look at it that way, the missing bits may be disappointing when highlighted, but they're somewhat peripheral to the fundamental experience you're came to this game looking for.
This post digressed some. What I meant to say was SR2 plays worse than SR3 to a degree I definitely didn't recall and wasn't prepared for. I wonder if there's any chance of the PC version getting re-jigged with SR3 controls by way of the modding community.