The drawback of this plan is that it costs too much.
There is no particular fault in his character.
difficult point; crux; point of contention
Used when discussing the most problematic or contentious part of an issue, argument, or negotiation.
The sticking point in the negotiations is the pricing.
The crux of this problem is that no one wants to take responsibility.
There is one drawback to this plan.
My boss pointed out the flaw in the proposal.
We discussed how to resolve the sticking point in the negotiation.