Well, there's a couple of sweet spots compared to the Qatar chart: 1) short haul economy (that may even beat B6 pricing in many cases); 2) transcontinental Mint (Qatar blew this up because of the redemption bonanza last fall); 3) that BOS-DUB flight clocks in potentially just under the 3000 mile mark, making it 60k in Mint (this is close enough it needs to be verified). Of course, this will be much less exciting because of Etihad's very bad, no good cancellation policy. Probably only usable for last minute flights.
On the earning side, it does seem like crediting to B6 is appealing on Etihad, but I would also consider crediting some economy flights on B6 to Etihad. As a revenue program, B6 gives very little for cheap tickets. This is especially true if you book through a 3rd party rather than direct. So, some of the cheap Caribbean flights will net you quite a few more Etihad miles than B6 miles.