It is a hazy patch in small telescopes, large scopes can resolve some detail. It is difficult but possible to see in binoculars. The Pleides are a large open cluster in Taurus. Easy to resolve six stars naked eye. Binoculars provide the best view.
Large telescopes can show some nebulosity.
M35 is in Gemini, the others are in Auriga. All can be seen naked eye as faint fuzzy stars, binoculars reveal fuzzy patches, low power telescopes can resolve these rich clusters. It can be seen as small fuzzy patch naked eye. Binoculars show some detail, and the view is superb in most any scope. M43 is a small region of nebulosity next to M42, and probably requires the use of a telescope to view.