With the pro scouts to whom The Sports Xchange has discussed Wallace, outside of the Steelers' organization, of course, there is concern about the way he finished the 2011 season, a perception in some quarters that he is a bit of a pouter, and the suspicion he isn't as polished as Pittsburgh's two other young wideouts, Antonio Brown and Emmanuel Sanders (when healthy).
Coach Mike Tomlin used to needle Wallace that he was a "one-trick pony," a deep-threat boundary receiver with dubious route-running skills. Wallace has developed into much more than that, even the Steelers would admit, but there are some in the organization who feel Brown has a much bigger upside. And some, too, who won't lie sleepless at night if the team loses Wallace in free agency, and gains another first-round pick as compensation.
http://www.cbssports.com/nfl/story/17425826/steelers-wallace-might-not-be-as-coveted-as-thought
Good article on Wallace