I like Datish. He has the intangibles for a long career as a quality NFL lineman. I'm talking 10 years plus.
Most people (and surprisingly, scouts included) don't realize that you have to have brains to be a lineman, in order to remember all of the pass and run-blocking schemes. It's why Mandarich failed in the NFL, and why Gallery and (notoriously here) Mike Williams, are failing.
Pure size and speed are nice on the line, but not needed as badly as say, running back. The kind of line that you want is a bunch of lunchpail guys who are not afraid to work in the trenches and get their hands dirty. Joe D. was that type of player. Kent Hull and Jim Richter were those type of players. It's one reason why the Bills' line had so much success in the late 80s and through much of the 90s.
If Datish is there in the third round (or even the fourth), by all means, take him!!!