If you have already imagined......you are only a few steps away from improving your work.
If you know you can make it better, why not try?
I did a test run of this mission. Definitely Short and sweet. No elaborate insertion, no strategic coordination of attack and no fancy extract.
At the start I felt as I was a lonely camper running around trying to find the safest bush to take a leak in. After several reloads of finding the better spot I ended up allowing the column to pass me by and take them out from behind to allow me more reload time while they were searching for the threat. After that I crawled (A reminder of the old OFP days) nearly 200 meters southeast before dashing north for the evac area. I made it nearly to the road that leads toward Chapoi and the mission ended.
Wow, I really must agree with Denz on this one. So many editors forget the foundation of a good time, me being one of those, that they don't remember the sheer joy of making it out of a simple hot zone alive with only your BDU's.
In my book the rating would be as low as the 3 that you first figured for. However, since I was once gently scolded for grading a mission out of context I must add a point for the simple fact that you accomplished exactly what you intended to. You created a mission that was fun, butt clenching, quick enough to scatter my mind for a few minutes and not have to download addons in order to see it. Kudos. If you would like me to review as is....I'd be happy to. If you prefer to add some more detail to it, then please remove the (Review Please) tag from your title.