Quoted from tiesmasc:For me: Shadow > Demo Man >> Dredd
That said, you stated this was for others to play... including the casual player. In that case I'd actually recommend Demo Man as the #1 selection based upon that criteria as the extra buttons on Shadow can be confusing and DM has a much easier / quicker fun factor (but not as much long term playability in my opinion).
I would agree with this. Shadow is the best game of the group, but probably not the best game for you based on your description. Shadow is similar to BSD in that they both are challenging and the non pinball player will most likely give up on them before they appreciate / understand why they are so good. DM has lots of MB, great shooting ramps and the handles are fun and unique. Because of this DM seems to be a go to game for everyone.