Good fingerings are very important for good cello playing. Some passages are impossible with a poor fingering but relatively simple with a great fingering.
A good cello fingering can:
1) Save many hours of practice time
2) Allow a passage to be played at higher level of quality (in terms of cleanliness, intonation, etc.)
3) Help to prevent a number of mistakes during a performance.
My unique book on the topic, Cello Fingerings: Improve Your Left-hand Game discusses the topic in a comprehensive manner, but now there is a series of free videos to a visual demonstration of the fundamental aspects of cello fingerings.