DoW1 and DoW2 are completely different game styles, so you cant really compare. The first is like any typical RTS where you can mass units, so it is good in that respect and I still like it a lot. DoW2 is more focused on micromanagement and co-ordinating select units strategically to win, making sure you have enough range of units to counter what the enemy throws at you. It is really quite 'counter' based, but still very good in this respect as well.
The campaign for Retribution, while still has a focus on 4 heroes, these heroes are now solo and not apart of a squad like the vanilla and CR, and you now have the ability to build squads to assist your heroes, so it is like merging the two games together, to some degree.
This game is looking to be great, and I played the beta and really enjoyed it, and cant wait to see what the campaign is like.