[quote=@tobiax]
I feel I've heard that before about the accent.

True, no envy. From what I hear it's a bitchandahalf as a second language. Most Americans don't seem to bother to use it correctly themselves. (The pattern in the US seems to be that those with English as a second language sometimes get notably higher scores in English/writing than native speakers. That being said, I have no data, and it's only positive stereotype.)

<Snipped quote by Vocalia>
I haven't heard the American English accents that are undiscernible as English, but I don't doubt their existence. I've heard people add a "T" into the word "shrimp". Like, an audible T right before the R. I can not, for the life of me, say it like that myself.
[/quote]

You probably have. It's a common stereotype about scottish accents, hell even English accents and so on. More common IN britain though XD.

I can actually see how a non-native speaker would score higher than a native, in an odd way. There's a lot about sentence structure and grammar I don't actually know. But a non-native speaker knows a lot more about that, in some cases.

I can actually understand most accents, though I occasionally have to ask someone to repeat themselves. (sometimes that's just because I'm deaf) I find asian-english to be the hardest to discern though. I dunno why.