Games using the same engine and assets.

[bjork]

WWF Warzone,WWF Attitude,ECW Hardcore Revolution and ECW Anarchy Rulz.They all sucked.

Amen. I understand the first one being clunky and weird since it was a shift to 3D or whatever for them, but all of them have that feeling of barely holding together.

 

[RageBurner]

Of course, but I mean the older or the oldest like the original one in PS2

Ah, right. Probably some sort of internal bespoke solution that might have culminated with the development of MT Framework (MT was first used in the franchise in MH3U according to wikipedia), so it's likely anything prior used this bespoke engine.