Tornado (and others), it's not the specific effects that are of concern; it's the idea behind them.
Even more fundamental aspects of the server seem geared towards PVP; regimented, grinder-based, arena PVP. Take the XP boost for killing mobs. It benefits me, and everyone else, regardless of PVP activity, and I'm not saying it should be removed (I like it). But where is the XP boost for mining gems? Breeding animals? The XP boost for killing mobs is directly linked, in the minds of everyone I've asked, to the public mob grinders, which are used mostly (from what I've seen) by PVPers, who frequently need to create new enchanted sets of weapons and armor for their battles. I don't use the grinders; it's too dangerous to go in the city unless, again, you're geared for PVP, and while I do go through some tools from mining and plowing, I get enough XP in one night of hunting outside my base, to completely repair/enchant any tools that need replacing. I have never needed to replace a set of armor (mobs drop plenty, and since I don't PVP, I don't need God armor).
Were I to get into PVP, I would need to frequent the grinders, make my God armor, and turn from building, mining, farming, and all other aspects of the game, in order to remain competitive; compare this to a regular game, which would require PVPers to hunt, mine, and breed animals in order to get their enchants (or trade with someone who did enchanting regularly, with a full library), rather than use the convenient facilities designed specifically for them.
To clarify, as text is an awful medium for expressing feelings; I'm not trying to be hostile, or to bring out the tinfoil hats and wave anti-PVP-lobby flags. I am merely stating some observations I have made.