As a reader, they bug me. There are places where flashbacks work, structurally - say, when a character has forgotten something important, or when new information allows past events to finally make sense, or in cases where the absence of certain information is crucial to the plot. In all of these cases, the flashback makes sense because the rest of the story provides context for it.
In chapter one, my feeling about flashbacks is that perhaps you should have started the story at an earlier point. Depending on the flashback, it might be a prologue, or it might actually be chapter one and you might actually be writing some later chapter.