I think the way Reggie was used in last season's offense was optimal for getting the best out of him. When he left NO for Miami, he became a much better runner. I think this is due to the Saints play calling. They used Reggie as Sproles; almost exclusively as a pass catcher out of the backfield. Now Miami also used him incorrectly, since they used him way more as a runner without the threat of throwing to him. (If anyone has stats that back me up of contradict me, please share me).
This is leads me to my concerns; with Lombardi calling the plays, and bringing the Saints' playbook with him, I'm worried we will see Reggie regress back to being just a pass catcher.
"The playbook that we’re starting from is the Saints playbook," Lombardi added, "so it will certainly be similar." (CBS Detroit; http://detroit.cbslocal.com/2014/02/07/joe-lombardi-brings-saints-playbook-to-lions-expects-to-call-plays/
I hope he calls plays that emphasizes Reggie's real abilities