Many of the base ingredients are the same, especially the aromatics. Garlic, ginger, onion. Combine them with with soy, chicken stock, and oyster sauce, sometimes chillies, and they do taste similar.
But its like any cuisine. You ask for a classic dish, and it should taste pretty much the same anywhere.
I don't particularly like take out oriental food, although maybe I'm getting it from the wrong places. Deep fry does seem to come into it a lot, frankly, I'd rather make my own. I get my wok smoking before anything comes near it, and fry for as short a time as possible.
A good fried rice with enough of the right ingredients cooked well is hard to beat
