It depends on the size of the television as well. On a smaller TV you probably can't tell much if any difference between Blu-ray and DVD.
You can on a 42" hdtv, if the bluray release is a sufficiently good one.
Go back and read this post in this very thread.
Surely the excessive use of grain removal techniques is not the sole reason for the amount of low quality bluray releases?
The article is not just about grain removal techniques really, there are many different processes involved in film transfer and all of them require the same attention to detail and adjustment.