Actually no. Fm13 has issues, but it doesn't stop you being successful with Arsenal or any side, not by a long shot. Do not confuse Me bugs with AI logic. The bugs do not stop you having a successful game.
Experience doesnt come into it. This game isnt FM12 or any before it, the AI is much tougher than before. If your tactical is approach is too static, or your thinking is poorer than the AI, it will shred you.
Firsly you shouldnt be thinking about "the correct approach" there is no one way to do it.
Rather you sit down and think how you want to attack and creat space. Who is moving through the lines? who will attempt to mve the ball arrond, who are the strike runners creating space.
For example Arsenal. I would want Santi Cazorla as my main threat, sitting in the pocket and playing my side through. AP support, roaming, moves into channels, so he is laterally exploiting space and dragging is marker. Podolski is pure pace and excellent finishing ability, a lethal direct threat, so Inside forward attack. to make sure we still have space, I need to offset the lack of width, so I set Gibbs at full back to wing back attack, to overlap pod, while walcott is set as a winger attack, though i may manually tweak his setting. Arteta is the main supply, so dlp support, and therefore I would look to buy an aggressive mobile enforcer to play as ball winning mid/defend or central mid defend.
That is just a small piece of logic you should be using. And thats just looking to construct an approach, not even talking dealing with the opposition, man management, motivation, dealing with weather, integrating youthing into certain games, squad coherence and balance etc