I think that it is way too early to make a conclusion about this group. Most of them have had only one start thus far. I am sure that several of the newly acquired pitchers around baseball will have positive impacts on their 2013 teams.
As for Harang, he has been a 5 inning pitcher for several years already with little success. I don't like his prospects with us. Has anyone signed Freddie Garcia? Even with his diminished stuff, he has consistently shown that he can give his team a chance to win. That's all you can ask of a depth option. Hopefully, Aceves can do that for us at aleast as well as Julian Tavarez did in 2007.