my first 3-4 builds were all non-trade gameplays. it starts hard, gets harder and then, eventually, becomes too easy.
my biggest problem is sneak: it's absolutely in my 'gamer genetics', lol. i have to remind myself to not sneak cuz i do it without thinking. i replay splinter cells all the time, lol.
for me, since, i began by playing on master and not using the trades and having no clue about exploitation, it's no big deal.
the biggest thing to realize is that you just need slow everything down and play smarter.
after i played a few DiD's i improved my combat skill big-time.
once you understand what's difficult in the game you take the appropriate steps to make it easier. exploitation doesn't have to be used.