I believe for most people, it’s safe to say the core gameplay is great. I feel as though most players have fun when taking the game just for the core gameplay, but it falls short in a lot of areas. Here’s my immediate thought process.
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Fun gameplay, yay!

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Challenges, sure, I played MCC anyways, I can deal with it.

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Challenges get more demanding as I complete them.

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Gameplay with said challenges is extremely unfun!

This is usually the most cited issue. The next one is usually a variety of other things. I think the next biggest one is BTB. My gripe with BTB is that balance is questionable with the RNG, there’s very little variety, 1 or 2 of the maps I don’t like, etc, etc.
The game is fun, but it has a LONG way to go. I can see myself getting hooked on campaign until I stop having fun on that or they resolve some of the biggest problems.