The Nerevarine - I contribute my success to you.
However, here is my take/adjustments on Commando.
Snipers actually take 2 shots, but the shots can be spaced around 1 1/2 seconds apart. If your swinging, speed it up and you'll get too cover in time.
When there's multiple Biomechs, never stay still for too long. They WILL get you, and it will HURT. Kiting/Throwing takes too much time to really be a viable attack, but the punch up and kick combo keeps you in cover (Technically) and hurts them quite a bit. Preferable attack there.
As said in the previous solution, skipping sections IS possible. However, if you can see one of those odd blue barriers in the distance, do NOT get close. There's likely a 'heavy' type enemy waiting to drop in so you can open the door. If your in an area with snipers and such, make sure to kill them first. Otherwise, you're not likely too make it.
Try and go for alot of the easier challenges, as the rewards (such as a health upgrade) are really helpful. Any ammo increases and such are great as well. However, I advise against collectibles. On Commando, it's a waste of time.
I completed Commando in around 7 hours gametime, taking breaks here and there for food and such. It's not too hard, just follow the tips from both of these solutions.
The Nerevarine - I contribute my success too you :)