I'll be very impressed if u win most your games with reaper FE into 3 rax vs marine tank builds.
And you're thinking one particular form of marine tank build. There's a lot of variations from 5 min FE, 7-8 min marine tank, 9 min marine tank, cloak banshee into 1/1/1 , just to name a few
I'm only Diamond but reaper into 3 rax with a fast +1 (Learnt it from Kang at a lan) is my goto TvT. You have to be very aware of what your opponent is doing though. But If you know for certain that they are doing a 1 base tank all in moving to the centre of the map once you have combat shields is a pretty easy way of dealing with it (assuming you can keep your marines in a concave as you engage). If they make it to my natural because I am oblivious or something, I wait for plus 1 if it is not too far away and run at them with all my marines and scvs. You lose a lot but 2 orbitals means you can usually afford it.
It all comes down to map awareness. Holding this kind of 1 base play in TvT for me is usually just a question of whether or not I was holding the towers that game.
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