I feel the same way. I feel like I have tried everything. I've made simple tactics, I've made complicated tactics, I've downloaded tactics(silk&steel, rainmaker, Mr Hough's and a bunch of others) and nothing works for more than a season/half a season. The few times I've managed to get a team to perform it only lasts for maximum one season. The most frustrating prt is when you think you have finally found a tactic that works and then during the transfer window you buy player's that fit that tactic and then it stops working.
What I find the msot frustrating is how a "bad tactic" manifests itself. It is not, that Özil doesn't get in the right position and from there can't deliver killer passes, but rather that Özil all of a sudden as no sense of first touch whatsoever and cannot make even the simplest of passes. If you however have a tactic that "works"(if you download one for example), Özil can recieve the ball in a bad position but through skill make a perfect pass to an attacker that will score.
I am not a football genius, but I also not totally clueless(played myself as a youngster), but this game must be for 1% of the people that have time to sit through watching the whole match.