Faros was pretty long. i enjoyed every part of it though. i want to complete all the sidequests, but the mako ruins that for me. i can live with the copyy and paste style layout of all the planets. but the ones that are very mountainous or hilly is what kills that for me. You have to spend so much time driving the mako and its just not a fun thing to do. if they were flat i would not care at all.
even still, i will end up checking every single planet. I have started using the wiki stricly for the map of the surface to find the goods that dont show up on the radar....no way i am searching those planets for all the hidden stuff