Not major one like unbeatable levels or muted cut scenes, just small ones like locking on to an enemy with secondary fire, and all the bullets missing! (metacritic.com)
The weapons were so much better in the first game thanks to them all featuring secondary fire. (nosleepgamer.com)
You can also express yourself through your playing style, and this is supported further through things like secondary firing options on all of your weapons. (gamestm.co.uk)