Honestly its a tough call. Yes the team is good. However like with every team it will have its weaknesses. Mei, Mabui, Tenten teams can break the team but if you play intelligently it'll work out. But when you run into teams with dodge, it may as well be GG if you can't bait the dodges.

I did hit 6 paths with the team near the end of December, went from 46 to 59 rather quickly. If you happen to run into a person you can't beat 2x. Stop queuing for the day and try again later. This will save you some headache.

Experimentation makes impossible for that Mei/Mabui/Tenten team. Yes, you lose Poison Tai (which is a blessing in disguise).
Round 1, you wait for enemy azure to finish standard healing, unleash Fuguki's mystery on Mabui to carry the chaos over into the next round.
Round 2, NO ONE else from the enemy can do anything except for the enemy azure to use mystery, which is impossible, as you start combo with Roshi and chaos enemy azure. This is where no-poison tai-is-a-blessing as it is almost impossible for you to kill enemy azure clone with only Roshi's mystery. If you ever kill that clone, it gives enough chakra for Mei's mystery, impairing your team healing (unless your main is faster), thus Tenten can wreck you next round. Otherwise, having both Mabui and enemy azure locked down, Tenten/Mei keep getting ignited, and Mabui would probably be dead by round 3.

Also, I highly suggest using Kurenai instead of Sailor. You will need your massive heal/shield to save either Roshi or Fuguki from being blitz'ed, plus you can freely use Healing Tips and give the CC role to Kurenai. That healing buff passive utterly ignores Tenten's round 1 dmg, and in arena, Kurenai heals for almost 4k HP and clears all debuff on whoever gets combo'ed (Wait for your main to cleanse an ignite and do Kurenai's). Sailor loses much usefulness on this team as you no longer rely on poison tai, and she can't save any of you in round 1 blitz. Your heals go weaker as you will be forced to take neurotoxin, thus, putting you at risk if you face LM blitz teams.

Experimentation makes impossible for that Mei/Mabui/Tenten team. Yes, you lose Poison Tai (which is a blessing in disguise).
Round 1, you wait for enemy azure to finish standard healing, unleash Fuguki's mystery on Mabui to carry the chaos over into the next round.
Round 2, NO ONE else from the enemy can do anything except for the enemy azure to use mystery, which is impossible, as you start combo with Roshi and chaos enemy azure. This is where no-poison tai-is-a-blessing as it is almost impossible for you to kill enemy azure clone with only Roshi's mystery. If you ever kill that clone, it gives enough chakra for Mei's mystery, impairing your team healing (unless your main is faster), thus Tenten can wreck you next round. Otherwise, having both Mabui and enemy azure locked down, Tenten/Mei keep getting ignited, and Mabui would probably be dead by round 3.

Also, I highly suggest using Kurenai instead of Sailor. You will need your massive heal/shield to save either Roshi or Fuguki from being blitz'ed, plus you can freely use Healing Tips and give the CC role to Kurenai. That healing buff passive utterly ignores Tenten's round 1 dmg, and in arena, Kurenai heals for almost 4k HP and clears all debuff on whoever gets combo'ed (Wait for your main to cleanse an ignite and do Kurenai's). Sailor loses much usefulness on this team as you no longer rely on poison tai, and she can't save any of you in round 1 blitz. Your heals go weaker as you will be forced to take neurotoxin, thus, putting you at risk if you face LM blitz teams.