I am surprised at this.With the exception of a few example (yes (Plymouth was brilliant) he doesn't offer the attacking option better teams have at fullback. Sorry.
Long has improved hugely this season going forwards as has been shown by the stats.
Meanwhile as KR has said, he is the best one on one defender at the club.
Our problem this season with full backs has been more that when Long and Ruffels have been out the replacements have been much poorer.