Someone please give me some advice

Ok honestly I do not know how to explain this without telling to much so Im just going to tell the basics. Ok I always knew I wanted to go greek for so many reasons but I never knew exactly what I wanted to do I mean I had my ideas but I am not the type to jump into anything. When I got to school for some reason I started hanging with xyz alot and REALLY started to like them and what they stood for and I was set on what I wanted to do but I still do not like the idea of jumping into things so I was waiting until I was ready. Now things have changed I mean I am still interested in them but recently I found out they are doing some stuff that just do not seem right. Basically they are letting someone that has not even been here a full semester pledge (I do not know how) and this chick doesn't even have a gpa yet. Also they only have a few people on the yard lets just say....3 and so I know they probably want to put more people on the yard but I really want things to be done the right way not just sticking people in to say its more people. The problem is I have been hanging with the girls of xyz not because they are xyz but because we are friends so I don't know if other organizations would look down on that. Its also alot more about the organization that I am starting not to like but I dont't want to say to much on that. Basically I need to know should I just look over these things since I like the organization so much or should I stick to the things that are most important to me??? Sorry if its hard to understand I didn't know how to word it.