The Bees head coach was speaking about the game during a pre-match press conference.
Frank, whose Brentford drew with Manchester United a day earlier, felt the game was disappointing.
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Asked if he enjoyed the match, he stated: "Not really.
I looked forward to watching the game. Two of the three best teams in the world not only in the Premier League right now.
So I watched it but I think they canceled each other out. I admire both (Mikel) Arteta and Pep (Guardiola) hugely for the jobs they are doing. Same style of play, same tweaks, same strategy.
Honestly, boring in the end. But of course, world class players, they were on it no doubt about that."