Keyword "ugly", not boring. I always felt Froch's style was ugly, granted he's retired. I can't think of any active fighter right now with an ugly style.
Considering the Keyword I'd say Ward takes it. Watching someone commiting so many fouls as an actual basis of his game is way too ugly compared to any other boxer I can think of right now.
Ward, he does not fight, he wrestles, holds, headbutts, elbows, and low blows, very low..................also insists he own the judges, referee, boxing commission, always...................it was Ward who said that neutral judges would be unfair to him. He told on himself, he believes in cheating and he always gets away with it................