>>329By training I meant going through all the maps and teaching how to play them, grenade throws and strategies and stuff, as well as general meta concepts for buying, saving, etc.
For me personally, any time I play with friends, I rank down, and any time I play solo, I rank up. This is because my friends suck most of the time or just goof off and throw easy rounds, and in solo there is a decent chance of being paired with a group of 4 who don't suck and I'm basically just their ringer. I don't think this would be the case in Nova or Silver ranges though.
We don't know all the factors for rank, but wins, losses, MVP, score, k/d ratio all play into it to one degree or another.
Play style is not the same as tactics or strategy. Buying Negevs and spraying Silvers to death is a tactic. Style is more about being passive or aggressive or playing mind games or aiming in unique ways to beat your opponents, etc. You don't have to kill people to win a round. You can have the sickest aim on earth and still lose.
I might start up a training program for /cs/ users who are at the beginner level. I'll have to plan out some things.