Yes, they will be efficient, and very explosive out of the gate.
People harping on 2 high. You're supposed to run teams right out of it. It's nigh impossible to play 2 high against the Shanny offense unless it is 3rd and long, as you no longer have to respect the run at that point. Good thing one of the main emphasis' of this offense is staying out of 3rd and long.
The biggest diff. observant fans will notice, is opponents will struggle to key in on exactly what the Seahawks are doing on a snap to snap basis. The exact opposite of what they've been in seasons past. Where they got into certain formations on certain downs and distances and you knew what they were running. The Seahawks tipped their plays in the past and did a horrible job of disguising what they were doing. That ends now.
What you will see is a lot of wide zone runs with Jet motion and Wilson booting out from 11 personnel. Good luck playing 2 high against that offense. (You have to play 8 in the box or else you will get eaten alive.)
It's a cat and mouse game. It's very hard to tell what is a run and what is a pass, as the formations and movements look the same to defenses. So they have to play it honest and straight up.
The Ram's ran a lot of uptempo. Wilson also is at his best when it is uptempo, so it is very believable that Is what they will look like come game 1. I think we won't see much of Wilson or the starters for that matter in pre-season. That's how McVay plays it, and it makes sense with them having such a veteran laden offense. So I would temper expectations for the pre-season. 17 game season has to be a factor as well.