Actually, I've been thinking this out a bit more and I'd have to say I think getting a 5% single stat bonus from each one of several bronze medals would be the best way to go. Hear me out before you throw a fit about this. First the rewards - 5% ATT from one medal, 5% DAM from another, etc. Next the reasons - a full 5% should be rewarded at bronze level because A) you are only getting one stat bonus from each medal. Given the time and effort required to achieve upper levels of some medals would effectively prohibit some players from fully maxing out their bonuses if they had to reach high medal levels to get full bonuses. Bonuses should be earned but still reasonably achievable. B ) Players will have to participate in different aspects of the game in order to get all the available bonuses. While this will result in players experiencing many aspects of the game, not everyone will enjoy every aspect of the game. Forcing them to continue in those aspects to achieve higher bonuses will discourage them whereas getting their bonus at bronze level will give them the option of continuing because they like it or moving on to try something else. An example would be a 5% DEF bonus for bronze bounty hunter. Some players will decide they like bounty hunting but others won't. Forcing those that don't enjoy bounty hunting to continue on to silver, gold, etc. to get their max bonus would likely result in them never achieving it or just flat out quitting but awarding the full bonus at bronze gives them a definite goal and timeline to get their bonus. Again, all this hinges on relic bonuses being capped at 5%. Nothing is set in stone on this idea, it just kind of came to me and I posted it so it's still very much a work in progress.
One BIG question here.
Are you talking gear stats, or base stats ?
If the former, I think a bronze medal giving 5% bonus is, quite simply, over-powered
If the latter, then most people don't have points distributed in anything other than damage (I know some do ..) so the bonus would be wasted.
Also, as I said in my first reply - there are 20 achievable medals now in-game and only ATT / DEF / ARM / DAM / HP to allocate these 5%'s too ... To which 5 medals are they allocated ? - and which medal gives each stat reward ?