Wow, that's ugly. I don't think the lens helped here but still ... are people expected to shop here or is it an office building? It looks like something from a bad SciFi movie. "The Blob That Ate Bull Ring!"
[Chalky] But OTOH, I like it just on its own. [Btd] I can't resist asking (in the typical debate-starting manner) why this bit of architecture is less intelligent than, say, St Paul's Cathedral. The best reason I can think of is that while this building looks like a jokily scaled-up sequinned amoeba, St Paul's Cathedral looks like, well, a cathedral - which depending on your POV suggests that Christopher Wren was less decadent than Future Systems. Also, some architecture critics have pointed out that Selfridge's is basically a shell-concept, with little of architectural interest inside it, so not a coherent bit of architecture? Are these your reasons for disliking it?