I don't have tons of experience playing 40k, and I'm curious to see what you all think of different organizations for the ubiquitous Tactical Space Marine Squad. We all know what min/max squads do and how they do it, so I was considering different ways of using them.

In particular, I was wondering how 10 marine squads with a plasma gun and the true grit and counter assault abilities would perform.

Also, what are some of the most effective ways you have seen them used, either by or against you?