I hate to slam the 2600...BUT I thought most of the arcade ports stunk. I owned a Atari 2600 as a kid, and was constantly disappointed by the quality of the games. I really think this is why I collect the arcade games now....because nothing compared to the quality of the "real deal" arcade games. (except 2600 Space Invaders two player simultaneous!)
Now don't get me wrong the 2600 was lots of fun as a kid, and I think I enjoyed the "non arcade/ original games the best....because I had no basis of comparision! Some of my favorites were Yar's Revenge, Pitfall, Enduro, Midnight Magic, River Raid, and Solaris.
Just my 2cents-
Mark