Originally Posted by Kitsuziza
With just three heroes it really narrows the strategies available to you if you want to win. It almost makes picking anything other than an assassination type hero pointless.
Tryndamere dominates this map..
You aren't viewing the big picture. With only three heroes, you are correct in the fact that it changes
the strategies available if you want to win. You would also be correct in saying that it "reduces some strategies from 5v5 that are no longer viable." However, an entire host of NEW strategies just became valid, and new possibilities will be continually formed.
Also, you are incorrect in your assumption that only assassination type heroes are valid. I did not see where you were going with this, as your very next statement contradicts yourself. Tryndamare does indeed dominate, but he is not an "assassination" type hero. Unless by assassination you meant "heroes that can kill other players well", but that is pretty much everyone, including Soroka.
Speaking of, Tryndamere can indeed be an insane competitor. I believe one of the top 3v3 matchups could in fact be Zilean, Judicator, Tryndamere /w guardian angel and DPS items.
However, both Zilean and Judicator are not assassination heroes either, yet in this instance could become one of the most feared matchups of the metagame.
Basically, just give it time and try your own strategies and see what combos work for you. You may be surprised how effective support can be when there are only 3 enemies to undo your work instead of 5.