I think it's a great statue but it has been said that it is not for a few individuals to decide which people should be honoured by the commissioning and placing of statues. I think that is a reasonable point but I do wonder how many "ordinary" people have ever been properly consulted on such issues.
So far as central London is concerned, there are dozens and dozens of statues of white men - often military men and sometimes military men who were involved in putting down uprisings in our various colonies - an assortment of royals and aristocrats, fictional characters (such as Paddington Bear and Peter Pan) and disproportionately few statues of named women (even many of them are emblematic or generic images, rather than honouring a specific woman for her achievements). Statues of BAME people are very thin on the ground.
I hope the Bristol statue is eventually welcomed by Bristolians as representing a future where the achievements of a wider group of people are honoured.