"I mean, what, as a Mature gamer, particularly attracts you about playing a Space Marine? The most I get is that it is kinda like playing one of King Arthurs Knights, or a Greek Hero IN SPACE!"
- I like the idea of playing one of the most powerful examples of Humanity that there is (no starting out as a 1st-level nobody Fighter).
- I like the thought that I and those like me are the thin line holding back Humanity's utter annihilation.
- I like the complete lack of the "loot-centric" gaming that is so common in games like D&D. "Oh, look. That dead Commissar left his gun for us. Too bad the awesome, age-old weapons of destruction at my disposal are so superior they make that master-crafted weapon look like a slingshot."
- I like the teamwork aspect, the fact that the group is much, much, MUCH stronger when working as a single well-oiled machine rather than just sending in the fighter to hold off the enemy while the wizard nukes everyone.
- I like the fact that, unlike other PCs in 40k that frequently soil themselves at the sight of blood, a Space Marine can face the worst horrors the 40k universe can throw his way without flinching.
- I like thinking that, with the proper planning, skills, and equipment, I can raise my very own Carnifex and one day ride him into battle. He will be named Mr. Snuggles.
Now, if only I could get one of my lazy players to run a game so I could actually PLAY a Space Marine sometime...
You're absolutely right about how role-playing works here. I still don't favour the completely over the top approach though.