I still play the first. There's actually a lot of people still playing, but mostly in Attrition and Frontier Defence. Great game. Not at all what it was sold as (the AI troops are largely inconsequential - they need to affect the flow of battle more), but a fun shooter. I prefer it to COD to be honest. Haven't enjoyed a COD game this much since BLOPS.
I look forward to seeing what they can do with the sequel.