Soldato
I don't agree, the spawn points make it ridiculous at times meaning you literally have to charge a checkpoint so you can't take your time and use strategy.
Depends what level really. If you take your time you can use a strategy on every level imo. Take the ferris wheel part - that can be completed without even firing a single shot using the correct strategy (although i had to use half a clip as i messed up mine placement slightly ).
Granted there are a few levels are very tough, no fighting in the war room i remember too. Using the correct strategy here (don't try to kill everyone, do enough to progress forward) the level is achievable.
What levels are you on about in particular, as the only one i can think of where your always in desperation for a checkpoint is no fighting in the war room.....