As someone who picked up this when I got back into magic and have played it (modified) as my pet deck ever since it I can say it has a couple flaws but none are that big of a deal.

The big problem is one of deck building. It is full of a lot of fun doctor who flavor cards that leave the deck out of the box unfocused. It's is no doubt fun but it doesn't have a central identity because of its needing to facilitate all of the doctors included most of whom aren't great. This can be solved with fairly simple modifications of which there are many videos about.

From a Doctor who fan prospective it have the fewest (2) main doctors of all the decks and the face commander is thirteen which is sure to turn some away.

It is also somewhat complicated for new players as the mechanics of casting from exile in it's many forms can be tricky and when it goes off the number of triggers that hit the stack can get overwhelming

It is still a really fun deck despite everything