I'm also playing on my laptop from time to time on lowest settings of course, as it isn't a gamer laptop.
got Intel Core i3 CPU @ 2,40 GHz
ATI Radeon HD 5470
and 4 GB RAM
It is running without any problems, loading time is a bit higher than on my gaming pc. graphics are fine with some problems here and there (like textures aren't shown properly). but after all its playable. Playable in PvE, capitals with many people ain't a problem but I wouldn't ever try bigger battlegrounds.