there is "rushed ending" when something suddenly ends without it making sense.
and then there are certain... type of people... i really struggle how to describe them nicely... who will complain about anything and say ending was rush for any reason. What i mean is, its one thing to suddenly have illogical ending of story that ruins most if not all plotpoints and break characters out of nowhere to make story sprint to the end, and its another thing to come to conclusion of story and feeling certain way that something that you think is important that clearly was not as important to author did not get answered or was not resolved, or some subplot got pushed aside for the sake of main story... but none of this means the ending is rushed, it just means you have criticism based on your preferences.
Its just sad and stupid that people use their own preference to make bullshit claims like "ending was rushed" "author gave up" "they just wanted to start something new" etc.