If you want to gain mod rank farm (as in consistently play) noobs. The exact same as global rank. If you are gonna remove global rank you may as well remove mod rank.

I think a match making system is the only way, it would be a load of effort but a menu like halo reach (i think) where you can veto the maps, instead you would veto the mods.

So seven competitive mods come up, you and your opponent both get to eliminate one and then you play 5 games in 5 mods. Winner of the majority gains rank. Loser would lose rank.

This would only work if losing wasn't a massive penalty. So you 3 our of 5, you would lose 1 rank. If you were to win 3 out of 5 you gain one rank. This basically means you gotta win over %50 of games against people with similar ranks in order to be moving up the rank ladder.

After you get into the top 20, only the best would be able to start winning %60 or more and then rightfully gain rank 1.

Once you get to rank 1 then a system would have to be implemented so that you have to play something like at least 3 games a weak other wise your rank would fall.

I guess the flaw in this would be that, once you are say rank 10 there probably would be very few rank 5-20 players online, in order for a fair game.

I think one of the largest benefits to this is that you would be able to play 50 unranked games in fun mods and your rank would not be effected.

New improvement came into my mind, since everyone hates alt accounts being good ranks, how about to start playing ranked games there is a 3,000 QI limit (like ultimate lobbys). This is totally fair, since anyone below 3rd dan would not be in the running for the 'good' ranks.