The campaign was never that great. The draw back in the day was the online... and back then Phantom Dust was such a unique game that to this day, close to 14 years later, almost nothing has or does play like it.
The remaster seems disappointing from a technical standpoint. Almost no improvements, and running at 30 frames per second. Its not really Microsoft's fault, the original source code has been lost, and they had to reverse engineer the game to get it running on the Xbox One... so while I understand why it's not abigger improvement, it's still disappointing.