Birds, especially parrots, love and need to chew. Toys are designed to provide an outlet for this very natural behavior, but unless you limit your bird's mobility and access, he will make toys of your books, picture frames and furniture. Again, this is more of a problem with larger birds, but even small chewers like lovebirds and parakeets are capable of being extremely destructive. I can't stand the noise. This is a major problem for some people.
Birds make all kinds of sounds and noises.
There are some that are quieter than others, but some people find even the low volume chattering of finches to be monotonous and annoying. Among the larger birds, Cockatoos and Amazons are the loudest. Conures are capable of incessant screeching, and even parakeets and lovebirds can give rise to complaints from neighbors. It doesn't talk. Many people find the capacity for speech to be the most appealing reason for buying a parrot.