It's fun once you get into it, but...

If you want to get strong quickly, paying is the fastest way. Your health will be melted away in an instant by top-tier players or players from other servers, so I absolutely cannot recommend this game to those who don't want to engage in PvP. On my current server, there's a guild recruiting members with the slogan 'full of unique individuals,' but be careful, as one of the players there is borderline insane.