Tara
You may not be able to get an unbiased view on this board, after all, we all (I think) bought new Mattamy homes in Milton.
I currently own a Mattamy home in Mississauga and we have been quite happy with it. Yes, there were some small issues, but that is to be expected of any mass home builder. The important thing is that they fixed every problem we ever found with the house. Some builders, as soon as you hand over the check, you never hear from them again.
Hope that input (as biased as it may be
) helps.
Derek