Hi there. If you love fantasy-genre MMOs, and specifically love combat and PvP, then you should most definitely be playing Guild Wars 1. The level of strategy and teamwork, and potential for unique character selection, surpasses that of any other MMO. You get diverse, yet defined roles in this game that people love (unlike Guild Wars 2, with it's lack of healers), and the possibilities for individual character templates and overall team composition are almost endless.
The highest form of PvP in Guild Wars 1 is Guild vs Guild battles, which places 8 players against 8 other players on the battle field (each team has a base on opposing sides of the map). Matches run for 28 minutes and the eventual goal is to kill the other team's Guild Lord inside their base.
Every month, on the 3rd Saturday of the month, there is a world-wide Guild vs Guild (GvG) tournament. The winning guild of the tournament receives $2,000. Details can be seen here -
http://teamquitter.com/viewtopic.php?f=7&t=32589
Because Guild Wars does have a rather high learning curve, I (and some others) will personally help mentor people who'd like to start up. My entire goal with this is just to simply re-grow the community of Guild Wars 1, and get a broader (and deeper) amount of competition going. For the love of the game!