CM 10.2 latest build is very good. Extremely stable. Battery is decent, still less than satisfactory. No bugs AFAIK . No random reboots. No force closes. Games that work very smoothly - temple run (all versions),subway surfers, dead trigger 1 & 2 ,GTA vice city.
Asphalt 8 lags when started but settles down afterwards and works decently.
P.S. - Don't judge your phone performance on basis of used RAM. Jelly bean is supposed to use more RAM.
Hope I helped.
Sent from my GT-I9070 using xda premium