I use that tip for Sentinels as well, 1Mmirg, and I echo your sentiments on it!
Sentinels is probably my favorite solo-play game right now. It's decent with other players, but I think I actually like it solo better.
Shadowrun: Crossfire actually plays pretty similar to Sentinels in a lot of ways and I'd say that with the base set it has about the same amount of replayability. The one thing with Shadowrun is that in order to level up your character you really have to grind out for a long time in some tough matches. I say screw that, though! Play it a couple of times and level up a little, then just give yourself a big karma boost to try out the harder stuff sooner. Honestly this is one I want to play a ton more of still and I find it a bit better as a multi-player (for my group at least) than Sentinels, possibly because there's less to keep track of (I can keep track of that stuff fine on my own, but it tends to annoy my game group).