For me, I went to the Catholic Church because: (1) There was one in the town I was living in at the time when I wanted to go back to church; (2) I had good memories of my time volunteering at an orphanage in Mexico that was run by the local Catholic priest in the village, who was a very holy, selfless man and impressed me greatly (also, Catholicism in Mexico, at least in smaller, poorer villages like the one I stayed in, is much closer to Orthodoxy in terms of its pastoral nature than it is in the USA, where people aren't as serious about their faith, usually); (3) My father's side of the family was all Mexican and Irish Catholics, so I felt like it fit well.
That's pretty much it. All personal reasons, I guess. I knew that Orthodoxy existed (I'd been to a Russian Orthodox Church before as part of a field trip in a Russian language class I took around age 19, and also to the historic Russian settlement of Ft. Ross, since I grew up in the closest town next to it, so it is well known and loved by everybody in area, whether they are Orthodox or not), but it wasn't until I found the Coptic Orthodox Church that I really felt drawn to it (odd, I know...what can I say, I am odd).
I think other people's reasons are right, too. Like in my home town if you're not going to be Protestant, the Catholic Church is the only game in town. And it didn't hurt that the first time I went there (c. age 22), the priest there stopped me on the way out the door. "Hi, I haven't seen you before. Is this your first time? What is your name?" And when I told him my full name he said "Ahh! I knew your grandfather, years ago. A wonderful man! It's so nice to see you!" (My grandfather passed away when I was eight, so it made a really good impression on me; God bless you, Fr. Devereaux, wherever you are, and however you actually spell your last name...
You can say whatever you'd like about the RCC, but I'm glad I was there when I was there. I'm also glad I'm not there anymore, but I definitely don't regret it or think of it as something I could have skipped and still ended up where I am now. I don't know...God knows what He's doing.