Hey,
What is your opinion on group dates. A girl I am interested in had her friends over, and I said my friends wanted to meet her friends. It was ambiguous whether it was a friend thing or date thing. I was interested in her, but in order to see her I had to drag my friends along to occupy her friends. Also, she and her friends are Greek. My friends and I are Irish and English, so there is a cultural difference for everyone as well.
My question is, are group dates more trouble than they are worth. More potential for different people to not get along etc. If I am interested in her, should I not just man up and ask her out?

That sounds like fun. If you like her, it's a good opportunity for you to see her. Make a move there.

Are you concerned that your friends can't hack it?

Personally, I really like "group dates". Its allways a ton of fun and I enjoy this kind of social situations. Its a good opportunity to cycle between the fun/attraction kind of game, then have some deeper conversation and vibe with the girl youre interested in and then go back to the fun stuff. If your social competences are not that good yet, chances are the date will not be to great but theres much to learn in this kind of situation.
Nonetheless I almost never make a move on this kind of dates. Her friends are with her and my friends are all unfamiliar to her, depending on how the evening develops she will feel uneasy with a move very often. Go with the vibe of the evening, there is no "right" solution.

cheers

I think its fun too. Do you think the cultural difference should be a problem or what?

But you should isolate her at some point before you escalate (if the night is going well). If you go on a dinner date and all four sit at a table its hard, but when you go to a crowded bar or nightclub its easy for you two to 'disappear'.