If it's a parody then I don't think it does a very good job of being a parody. Just comes off as an extremely cliched Shonen. Easily the worst WSJ manga outside of To Love Ru (in my opinion.) Though I didn't mind the beginning so much.
Gintama is a fairly different type of series (also far from generic.) Though it's a bit more reminiscent of the early portions of Reborn as far as genre is concerned. I'd consider it one of the best series in the Jump (probably #3 after OP and HxH.)