Stronghold Crusader 2 plays like any old RTS, much like the original.
There's been a graphical overhaul, new campaigns, new units, enemy AI that isn't ridiculous, and a couple of new mechanics. Anybody who has played the first one will get that familiar look and feel - and possibly some nostalgia from all that time spent on your parents' PC playing it. The best way to look at Stronghold Crusader 2 is a modern upgrade from the first game.