Well, while the two ideas are connected, I wouldn't say that one issue was the only thing that drove me to leave the Church at large.  To answer the question, though, I absolutely did not feel that going to services was making me a better person, nor did I see that happening much around me.  In my mind and experience, being a good person and going to Church were not connected at all.  The people I know who seemed to become better and kinder and more fulfilled over time, myself included, did not become this way through Christ, or through any organized faith, for that matter.  I know there are people who feel that the experience does in fact improve and enlighten them--that's wonderful.  I know there are also people who feel that they need religion to spur them to self-improvement, that it wouldn't happen without fear of death, community influence, etc.  I get that, too--I think the people who admit to that have admirable self-awareness.  But it didn't work for me, so I left to find more effective ways to fulfill myself, to find community in a group of people who didn't use Christianity as the main thing bringing them together.  I hope that answers your question!

Btw, I laughed when I saw the "Christians against Christians" t-shirt, but then again, I'm snarky to begin with!