I recently went back to playing DoW Soulstorm which led me to buy DoWII Retribution (which is so disappointing) in a hope that it would be ok, but it's completely different to DoW 
I am still playing through the singleplayer campaign of DoW2 Retribution but it seems so tedious, the control system is terrible as you can't define control groups and the UI just seems like something is missing.
Anyway, are there any newish games similar to the original WH40K Dawn Of War that are worth playing
I think the only RTS I have played which is similar is Starcraft 2

I am still playing through the singleplayer campaign of DoW2 Retribution but it seems so tedious, the control system is terrible as you can't define control groups and the UI just seems like something is missing.
Anyway, are there any newish games similar to the original WH40K Dawn Of War that are worth playing

I think the only RTS I have played which is similar is Starcraft 2