Would a 4-3-3 work long term?

I usually play with 4-4-2 but now I have 2 mc's that are 4*, 2 st's that are 5* and 1 st that is a 6*. Also my ML and MR are both 5*. I'm at manager level 5 if that matters as well. I switched to a 4-3-3 today in a champions league top 16 where I tied the team 2-2 last time we played but this time with my new formation I won 5-0. Granted I played at home, but nothing else changed except my formation.

So my question is, did I just play a bad team or can this really work on the long term?