Wyndham's biggest problem IMHO is penetration. They simply don't have very many properties in upper upscale or moderate segments compared to Marriott/Starwood/Hilton/IHG.
They have PLENTY of properties in lower tiers - Ramada, Days Inn, all the way down to <shudder> Knights Inn. Far fewer Wyndhams and Wingates, which can be nice.
However, a FlyerTalker is normally someone who is maximizing points and miles. You simply can't do that with Wyndham if none of their good properties exist at 80% of the locations you travel to.
I agree that Wyndham and especially Choice Hotels (Comfort/Clarion/Quality) are probably more favored by the drive market - the John Candy shower curtain ring salesman comes to mind.