Pro: crouching against cover to hide from enemy fire safely
Con: difficult to tell if crouched or even if behind cover
Pro: can hit a button to bring up current destination
Con: constantly having to hit this button because of bad terrain graphics it's hard to tell where you are going or need to go, mission orders are very vague
Pro: when knocked out a friendly unit or co-op player can revive you
Con: struggling through campaign is a constant death-revive-death-revive chain. And you can't always be revived. The computer players have magic bullets. You ARE going down.
Pro: can pickup and use guns of enemies killed
Con: weapon changes do not carry through stages or even through most cut scenes