Final answer:
The speaker's perspective in the poem can best be described as bleak and despairing, as evidenced by the descriptions of gloom, depression, and desolation in the various texts.
Step-by-step explanation:
The perspective described in the provided excerpts from various texts consistently aligns with a tone of bleakness and despair. For example, the narrator's experience upon seeing the House of Usher involves an 'utter depression of soul,' reflecting a profound sense of hopelessness. Similarly, Mariana's mood in her 'lonely, crumbling grange' echoes this sentiment of desolation through the dreariness and boredom of waiting. Therefore, the mood created by the authors in these cases can best be described as bleak and despairing.