Really? I actually thought that one was easier than a few other parts prior. The London Monitor gave me more trouble than the Gibraltar Bridge did (but I did die a few times). That part plays more like a COD than anything else in the game prior, though, so just be sure to take cover as often as possible.
Also, Gibraltar Bridge is super easy if you have the Lasercraftwerk up to date on upgrades by that point. The scope attachment where you can charge it up for a battery-draining blast takes the robot guards out very, very quickly. There's also the rocket launcher that the SS guards drop which you can pick up and use to weaken them.
The key to it, though, is taking cover and shooting around the corner as often as possible.