Should i make this fantasy baseball trade?

Yeah, I would. Haren is looking to have his first successful second half in roughly 5 years, and despite having a 4-4 record, note that his ERA is only 2.42 and he has 78 strikeouts. Arizona's offense needs to give him more run support for him to have a good record. Derek Lowe has been money well spent for Atlanta, posting a solid record of 6-3 and an impressive 3.40 ERA. I feel that Aubrey Huff is an underrated player. He has started off a bit slow, but looking at his final numbers from the last 2 years combined, (47 HR's 180 RBI's and a .292 average) I would say that he could be a starter for you this whole season. Adrian Gonzalez is a nice power hitter to have, but good 1B are easy to come by this year, so it's a great deal for you, I honestly am surprised that the person was willing to give up so much, you clearly have the better end of the deal.