Kaffis wroteColon4th Edition is as D&D as your DM chooses to make it. If your DM pays only lip service to whatever your preferred setting is, then yes, it's D&D in name only.
It doesn't have a lot of guidelines for roleplaying, but do you really *want* rules for roleplaying? I don't. The focus of the rules is on dungeon crawling, and that's just fine and dandy with me -- D&D started out as essentially a stripped-down in scale tactical wargame with fantasy trappings anyways.
And that's what 4th Edition is. The powers place a lot of emphasis on movement and creating tactically interesting situations with a bit of cinematic description in the flavor text for each power. How your DM leverages this is likely to seriously color your perception of the game. The roles concept it introduces hearkens back to the emphasis on group synergy the original D&D classes promoted (you know, back when it was "mage, elf, fighter," etc.), which I like.
Interesting. We are going away on two weeks holiday at a self-catering rental on the coast so we are going to take some games with us to muck about with. the D&D starter set will be one of them but he's sweating on playing his Space Hulk game. He's had one reply locally from someone who is trying to get gamers together for a D&D 1st ed on Gametable (I think he means THIS)
Kaffis wroteColonPhoenix -- since you mentioned 40k, I play a Sisters of Battle army I'm still working on painting, and I'm starting up a White Scars-esque Bike themed Space Marine army, too.
My son has finally worked out his 1500 point Grey Knight army (with dreadnought and Inquisitor lord) and hopes to have it built by Christmas. The plastic figures he got with the Space Hulk army are amazingly well done for plastic (plus you could substitute standard WH 40K figures if you wanted to work up a scenario)