i agree there should be some REAL serious medal awards that are hard to achieve, I collected some ideas together too:
- Win a DM match without dieing. (with playing from beginning)
- Win a match with the highest nex accuracy.
- Same with mortar
- Collect more than 50 frags in a match (match not longer than 20 minutes)
- Collect 5 airshot on a match.
- Collect 5 headshot on a match.
- Make at least 15 frags in a DM match with shotgun (shotgun ftw)
- Collect at least 10 frags with a single quad rush
- Collect more than 20 quadfrags on a DM match
- Be the first in CTF in the winning team with more death than frags (for Mirio

)
- Frag someone midair with laser
- Frag someone midair with rocket (without secondary button blowing it up)
- Kill someone with mortar from more than XY unit distance
- Frag at least 3 guys with one single electro-combo
- Frag two guys in the same time with one nexshot.
- Make a midair frag with hagar secondary (crazy

)
- Finish a map with a kill/death ratio at least 5
Also, about ranking system, I was thinking of a cool idea: how about to make some of the neatest characters and colors unlockable? Not many, just like 5 chars and 5 colors or sth. It should depend on the players "level" wether he can choose it or not (headhunter, lurk, armored carni, fricka and quark maybe). However I orignally thought this idea would be the best to implement in the single player mode, so people will have intention to play it through
Ohh and also, i think from medals there just cant be enough, so maybe it should worth to create tabs under ranking, like: frag combos, skill, experience (for all-together frag amount) etc... just to keep it clean.