Ok, so i guess this if finally my chance to get a saying in this. Have you guys ever noticed how RIDICULOUSLY high peoples mcmmo stats have been? A guy with 5000 in Power Level can easily beat the crap out of any noob, no matter what kind of weaponry. Also, most fights tend to be three seconds short, mainly because someone fucks you up using some highleveled axe skill. Suuuure, no newly joined guy shouldn't be able to beat a veteran, but leveling up mcmmo takes too long! If I were to try to level up my swords skill to let's say 300 from 0, it'd take several weeks, and by then the gym leader i was going to beat with those skills have leveled up ANOTHER 100-200 levels. Basicly, those who joined early got all the easy cheese, while those who join in later on have to work twice as hard to earn all them badges.
I havn't checked out Heroes, i will now and leave a response, but if you were to pick mcmmo, i would heighten the requirement for leveling up, and decreasing peoples levels. That way it would be easier for people who have lower levels to beat over-powered players.
If you wonder how it would be done, i could show you an example. A 100 swords guy facing one with 400, who will win? Obvious. Let's say that they've earned 10000 respectively 40000 exp each (not real Mcmmo requirements!). If we instead of 100 exp for each level, why not make it 200, or even 400? Then it'd be 25 vs 100, which in my opinion is way fairer odds. Sure, it will still be as hard to get exp, but those who got tons wont have the same advantage.
EDIT: I've checked Heroes now, and tbh, I'm not fully sure which plugin we should have. Mcmmo is good for people who want to be the one-man army, without any other weakness than other, more powerful one-man armies. Heroes on the other hand adds more teamwork to it, but there is the possibility that one class would be more powerful than the other, and thus everyone would pick that class.
What i want you to know is that you should
not be afraid. It's your server, you should not hesitate to nerf something if it needs it so critically. Sure, maybe a couple of guys get mad, but doesn't that happen every time Obama does something? I'm not siding on any plugin, just giving comments here.
-Slaum