[BlackSolider]

I'd say CTF but it could use some changes. I'm not sure how things will be different with default, as I haven't tested it much, but clearly there are several gametypes that are never hosted for various reasons, and a few new ones would be a nice addition.

Beyond that, the card game, bowling, and mini game system could all use some updates.

The overworld is fine IMO; we simply need a reason to leave lvl 14 and visit those areas.

As for your examples (in order)
-explosions never bothered me, but if you can make a better one, go for it.
-makes sense
-not realistic
-never used either, but I'm not sure how a "bird shot" makes sense by name
-seems fine but a change would lead need massive adjustment by the players in timing (sparring + events) and you might even have to make bombs + arrows faster to keep up so I'm not sure it's possible
-higher lvl swords being able to smash through stuff makes sense, though having different lvl swords do diff dmg (1, 1.5, 2) would make things very, very complicated for events

Those are some of my thoughts.