What this Bond film is lacking is...

For me, what is the most lacking in this film is a villain that is intent on world domination, or some other megalomaniacal enterprise.

When you get right down to it, the only thing evil about Scaramanga is being a killer for hire, and murdering his way to gain control of a company that, in the end, only wanted to sell solar power to the highest bidder, using stolen solar cell technology.

They seem to have addressed this issue in the later Bond film "Die Another Day"; where the villain was going to use solar power to start a war, rather than just getting rich.