Don't listen to these people, Anastasia1. Ask your priest!I did yesterday. He said there are no perfect parishes, and you should go to the one that best fits your needs.
I'm in the lucky situation to have five Orthodox parishes pretty close to my house. One is Greek. One is ROCOR. One is UOC-USA. One is Moscow Patriarch. One is OCA.
I bypass the Greek one (actually the closest to my house) for one reason: the music. Byzantine chant does nothing for me. If this was the only church in town, I'd go to it, but it's not, so I don't have to.
The ROCOR church is very ethnic: services in Slavonic (which I don't mind) and sermon in Russian. It's a very Russian parish. THE UOC-USA parish is similarly very ethnic, only Ukrainian. Both cater to their respective immigrant communities.
The MP church is just a bit further away than the OCA one. They do things about half Slavonic/half English. There's a good mix of immigrants and American-born parishoners (both cradles and converts). I really like the priest and the deacon.
I settled on the OCA parish because it's all in English (with a smattering of Slavonic here and there), it's literally five minutes past the Greek church, the people are nice and welcoming, and, of course, the music. They do a mix of obikhoid and prostopinije tones, the latter of which I have a love affair with, so to speak.
As your priest noted, if you have the luxury of multiple parishes, find the one that suits your needs best. If you don't have the luxury, or you find that all things are generally equal, go to the closest one.