I was convinced that a party of all Ninjas and Samurai would be unstoppable, but I never could make it work. I recall leveling up to a point where a high enough character would get 3 attacks per turn, and then when hit counterattack twice. Multiply this by the whole party.

But realistically, at some point this flurry of attacks every round just fell over because you need better magic users for enemies with certain weaknesses. My memory is fuzzy, but it also may have related to the increasingly large hordes of enemies which would dilute the effects of so many attacks.

You might like this blog, the author plays through CRPGs in chronological order. Currently they're at the mid 90s. https://crpgaddict.blogspot.com/

Also some more worthwhile ones:

  Infinity engine games (i.e. Baldur's Gate engine):
   Planescape: Torment (if you like the story aspect, combat is less engaging in this one but not as bad as some die hards will claim; skip the newer Torment form inXile)
   Icewind Dale I and II
  
  Arcanum
  
  ATOM RPG
  
  Wasteland 2 and 3
  
  More that I liked but will be a matter of taste:
   Shadowrun Returns and sequels
   Neverwinter Nights (early 3D graphics that are nothing to write home about unfortunate design consequences from supporting multiplayer, but has many worthwhile fan modules)