I don't know from direct experience with the Codemasters company if this is true, but from playing a lot of their games back in the 80's, that would be pretty obvious. The did have some GREAT games that sucked many of my hours away, but for each gem there were maybe 10 disasters. Yet to look at the back of the tape you'd think they were all the best game ever. How many times can they write, "This Game is Amazing! - Richard Darling" before my weak, 10 year old brain realized Richard Darling directly profited from the successful sales of the tape, and as such would say any old nonsense to get me to buy it?
Saying that, the Dizzy games, BMX Simulator, Rockstar Ate my Hamster, ATV Simulator and Grand Prix Simulator, were well worth the 1.99 I paid for them!