Roll Damn Tide!
Just wondering people's opinions are on how good it plays as a solo game?
I've played it a couple of times solo and I rather enjoy it. Both time I've spent the early game wondering if I had a chance because the AI accumulates points at a pretty steady pace, but it takes a short bit to get your machine rolling.
For added difficulty, there are solo variants on Portal's website that look to me like they could add a good deal of difficulty.
Official Solo Variant Rules