The true western "end" of Great Britain is of course Land's End. Although, strictly speaking, this is not the end, since there are still the Scilly Isles behind that.
The cragged rocks and the mostly rough weather give the place its own atmosphere, the nearby built visitor centre and the heavy commercialisation can't change that. The best way to approach the place is to walk along the coastal path from Sennen Cove, that way you can enjoy the landscape best.