First 40K game I've actually finished, I really enjoyed it.
It's probably the closest videogame to the actual tabletop game except you can move shoot move and there isn't a restriction to how many of one model you can take (I ran 8 Hellblasters every mission during the latter end of the campaign) Keep in mind that in almost every mission in the campaign except for the last one you will need to kill every enemy unit to win.
If you like turn-based strategy and 40K I highly recommend this and I don't even really like Blood angels