One way to check is to enter your site's title tag into google. When you enter it with quotes, it should be at the top spot. Without quotes, it should still be pretty high, at least first page or second page of Google.
However, this method will not work if you have a generic title tag. It has to be somewhat unique.
I once had a site that got penalized pretty badly. I tried entering the unique title tag into Google in quotes and it was always at position 950 or something like that. If it is on the first or second page of Google, it should just be the dance.