Personally for me its never been about beating people of the lights for exactly the reason you say. I prefer using the potential when on the move. For example, coming back from a track day last year I had a Civic Type R bumper to bumper. I was doing 40 (the limit) with him looking to overtake when it went to a national speed limit (70 in this case) As it opened up to a dual carriage way I kept to the left letting him move to overtake. When he started to gain I accelerated to a little over 70 keeping him well behind. Yes its childish but I drove within the limits of the car and road and at the same time had a bit of fun with a hot hatch.
Right, so you have to put up with the image, interior, quality, spec level, general rubbish things that "sleepers" have, daily, so you can have instances like the one above, which happens how often?
And no matter what you say, a Corsa is never guna handle as well as something thats been built originally for handling well in the first place with the same spend on it.
lol