I can't think of any reason not to just carry a shotgun as a secondary weapon with Overkill. Seems like you'd want your attachment slot for something else. Was it just added to make a long list of attachments or do some players love this attachment?
Is the Shotgun Attachment tactically useful in Modern Warfare 3
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Related Solutions
Here is an unofficial weapon stats chart:
Modern Warfare 3 does indeed support dedicated servers (see here):
Will Modern Warfare 3 have Dedicated Servers?
Yes! Modern Warfare 3 supported matchmaking as well as Dedicated Servers, allowing players to find and filter via an in-game server browser or set-up their own Dedicated Server for complete control, without being restricted by any 3rd party hosting requirements. If looking for a Dedicated Server to join, if you choose not to set up your own, you can filter and favorite by Ping, Map, Gametype, Hardcore Variants, Voice, Password, and many other options.
As for an approved server list, it appears the ranked servers are managed in-game (you have to enable browsing of dedicated servers in the options to even see those); I'll update if I find anything.
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Best Answer
To carry shotgun as secondary weapon you need the Overkill perk (shotguns are primary weapons in MW3).
Assault rifles are great weapons for mid to long range combat, but in close range fall behind SMGs and shotguns. Shotgun attachment gives you upper hand in close combat. However, note, that attachment itself is weaker then "pure" shotgun. Still it's quite handy when you are sweeping a building or you are in any situation with very limited space.