Don't worry about soul swap (horrible talent is horrible) lol, but yes i agree but my comparison was from my experience thus far with aff and shadow.
My 2cents is that shadow looks to be in a great place coming into 4.2 with the changes planed, you didn't just take a slap of 12% then nothing in return so single target/bursty will be how it is in my eyes for the class with still great dot cleave damage.