George Bush can't speak very good english, and HE got to be president of the US, I don't see much of a problem...
Seriously tho, Dion's english is FAR from perfect, but as tonnington points out, it's better than my French. Stephen Harpers french doesn't exactly sound all that natural either in my opinion, so it's pretty much even- I do believe that Dion is probably taking steps to address this, tho, as I am sure he's under no illusions as to his shortcomings in this area
Also, if the packaging is not too good but the product is excellent, smart people will still buy it