As a multiplayer game developer, bandwidth and latency are usually the forefront in my mind. Tech and electricity aren't as "limited" as internet usually is and about 75% of all customer service issues are dealing with internet. I can't tell you how many times people with terrible internet connections have told me to "fix your servers" in the games I worked on, when the servers are just fine and their ISP has started throttling them because they use too much bandwidth/data.

In any case, the games you mentioned aren't as action heavy as something like Deathmatches or, in my case, car soccer, so you can still have a narsty internet connection and it'll be fine for you and your 6 friends. The moment you start hosting huge raids or groups is when you'll start feeling the pinch. You'll also feel the pinch in games where the server controls the physics. The amount of data that the server will push is insane and it's replicated across all the clients to make sure the physics data is exact to each client. This is where exponential clients will actually kill an internet connection, speaking from experience.