In my opinion, I don't think Coleco did a bad job porting arcade games over to the Atari 2600, regardless of what people thought of Coleco's corporate strategy. There were only a few cases, however, where their ports were extremely poor (Donkey Kong Jr. was badly done on the 2600) or that they couldn't figure out how to make it exactly like the arcade (Zaxxon being that example). But overall, I think the concept of Coleco purposefully sabotaging the quality of their ports to the 2600 was mostly hearsay and very little substance. Consider that two of their ports, Donkey Kong and Carnival (both pretty good), were programmed by the Kitchen brothers (Dan and Steve) who went on to doing Activision games. And the Atari 2600 Smurf game was a quality port of the original ColecoVision version.