It's by no means a bad game but compared to Dawn Of War 1 & 2 it has some huge areas for improvement.
The campagin is linear as f**k while Dawn of War 1 and 2 offered multiple play though options.
The graphics are nice and SFX look decent but come across as cartoon'esk compared to DOWII.
A few units become OP and shit on the WH40k lore (Space Marine devastators losing to Ork Shooa boyz)
Cover and been removed and replaced with some weird bubble shield shit.
The game is essentially Command & Conquer Red Alert 3 with a Warhammer 40k skin slapped on.