Should I accept this trade offer?

I would accept the trade. Dunn has never been a guy who hits for a very high average. So if he does snap out of his funk he is not going to raise his average substantially. Smoak will hit 60-70 pts higher than dunn. Smoak at years end will produce around 25 hrs. Dunn who only has 5 hrs to this point you can expect to not have many more home runs than that. Also Smoak is hitting in the 3 spot for Seattle and will get many more RBI and run opportunities than Dunn who is hitting in the 7 spot for Chicago currently.