Although this game was a little buggy on release and looked average in graphical terms, it brought realism by the shedload and huge combat environments (along with the ability to drive or pilot multiple vehicle types). The editor helped improve replayability once you were done with the main campaign.
Thanks to a large modding community, we have videos like these to enjoy:
http://uk.youtube.com/watch?v=-QJOF6m2Z1s
http://uk.youtube.com/watch?v=l9x7yZqxWik
http://uk.youtube.com/watch?v=Jw0Ni9cF1eU
(warning, politically charged content in final video)
Thanks to a large modding community, we have videos like these to enjoy:
http://uk.youtube.com/watch?v=-QJOF6m2Z1s
http://uk.youtube.com/watch?v=l9x7yZqxWik
http://uk.youtube.com/watch?v=Jw0Ni9cF1eU
(warning, politically charged content in final video)