Mon Cher Ton Ton is a tourist trap (both the Shinjuku and Roppongi locations) - pretty expensive for the quality offered (poor C/P performer) and depending on tourist business to survive.
For great teppanyaki, I would recommend either Ukai-tei or Kira. Both have branches located in Ginza. Neither is cheap, but the quality will be significantly better than what's on offer at Mon Cher Ton Ton.
Tabelog links:
https://tabelog.com/en/tokyo/A1301/A130101/13002367/
https://tabelog.com/en/tokyo/A1301/A130101/13020504/