Sure is mate the G2 is a top device but running a custom rom unleashes the full potential of the device...I have had the G2 and moved up now to G3.
Best custom rom I ran on my G2 was by cloudyfa..
There are also tools available that will root and also install custom recovery like TWRP or clockwork mod making it real easy for you to do..
Make sure you do your research and do everything right as you can end up bricking device..
I can say don't worry it's dead easy as for me it is but for a newbie I advise reading up a fair bit first...