Not if you have multiple good index sites, and a membership with unlimited usage. I found nearly everything goes on there before it hits the torrents. Speeds on there are usually as fast as your connection can handle, too.
You don't even need unlimited unless you're getting those ridiculous 10GB "Linux distros".. If you're getting them in the 1.5GB range, a metered account might be the ticket. Astraweb has 180GB for $25 or 1000GB for $50.
Torrents are still good for older, international and otherwise hard to find content.