Interestingly (as someone who works in games industry doing marketing shit) I've never heard of OpenArena at all... but will definitely read up on it now you've mentioned it.
For Warsow, really pleased for them that they've reached 1.0, but from everything I've heard, specially over the past few months, they've made it a lot harder on themselves than it should have been, by the way they are organised (or not so organised) internally.
They are quite organized, it's pretty hard to be disorganized, when you only have 2 main developers, and 2-3 occasional helpers.
I think the biggest hurdle in developing this version was actually the choice of using libRocket to script the UI with. Turns out the lib is very slow, and it needed lots of work to get working properly.
There's vic, me and toukka doing any coding and kimza mapping some, jihnsius doing the music, and have pretty good agreement over everything we do, so I wouldn't call us disorganized :)
Same in OpenArena, the organisation is quite messy. There are some modelers, coders, people who make maps in the hope of making it to releases... But nothing is really organized. Releases are not planned, and when they are planned they easily go 3 months overdue. But there is progress, and I think the game is already fairly complete as it is. Thousands of players seem to think so too.
OpenArena's goal is to make a completely open-source and free Quake 3 clone with some additions like delag, and it's actually the opensource competitor for Quake Live. It could use some more developers I think :)
For Warsow, really pleased for them that they've reached 1.0, but from everything I've heard, specially over the past few months, they've made it a lot harder on themselves than it should have been, by the way they are organised (or not so organised) internally.