Not very entertaining, but it did give a breif overview into the history of video gaming for those wanted some info. A 6 out of 10 because not many people acctually mention the magnavox (let alone tennis for two) and usually just jump towards the Atari VCS as the granfather of video games. So congrats on getting fact right!
However, after you mentioned PONG in 1972 you just skipped right over hte 1978 talking about the unimportant simon, missing out some very important years in video game history.
1975 - Home versions of PONG were released.
1976 - Fairchild VES (later the Fairchild Channel F). The worlds first microprocessor based console with interchangeable "Video Carts" (cartridges).
1977 - The year the Atari VCS (later the Atari 2600) was released, you'd think after seeing it near the beginning you'd mention it.