It ALL depends on which games are included in the "bundle" that comes loaded on the retro mini console. The RIGHT way to do these things is to basically find a way to put every single game ever released for the original console on the mini ... but when third-party devs and game makers released games for the original consoles, they may not grant the license for them to be used in the retro mini (due to whatever reasons, but usually due to the royalties they would want).
I can't recall which one it is ... but one of those retros was released and the games that were missing amounted to mostly the games that people would have been buying it for. The games that WERE on it were (for lack of a better way to say it) the "crap" and "filler" games. Big name titles were nowhere to be found.
To qualify what I'm getting at ... I have one of the Atari 2600 retro consoles ... and it's fun, for about 5 minutes. Thing with that console is, the games are SO old, and SO bad, you just can't play them in this day and age. However, I would like to imagine that some of the "newer" old consoles had good enough games that they are still playable today, and would be fun if they put them on the retro-mini.