Before they ran out of good WR/TE and their OL fell apart, I remember the Titans running a good, sometimes potent, offense.
They haven't run on 1st down, and abandoned play action the whole time that Vrabel has been there. In fact, their offense went from bottom half of the league year 1, to top half year 2, to top 3 year 3. Year 4 and year 5 under this crappy OC have undone the progress that they made their first 3 years. J Rob missing on draft picks caught up to the Titans as well.
The blueprint for a successful Titans team with the roster that they had was there.