Is the Importance of a good Defense Overlooked?

You usually don't see the premier defenses drafted until the middle rounds and then the remaining defenses taken in the last few rounds. This week in my ESPN league, it was my defense that solidified my victory. It was a close battle in the first round of the playoffs between myself and Tyler's Poopcicles both us us had subpar weekends. I only had 3 players reach double digits in points and he had a little more, but coming down to the close of the 3:00 games it was a close matchup. Having a defense like the Steelers who rank number 1 in a few of the defensive categories put me over the top when they picked Tony Romo for 6 late in the fourth quarter of the Steelers, Cowboys game. So my question to all 1 of you who read this is should drafting a quality defense be more important that drafting a quality tight-end or even backups running backs and wide receivers? That is just something I've been contemplating lately.