The DS games are pretty good, especially to help learn the rules. Some of them even try to add a bit more than just choosing a duel in a menu (Spirit Caller tried this but kinda failed).
I've never really considered getting the Tag Force games since the title kinda makes me think of it adding a useless gimmick. Also I wouldn't really want to play it with PSP controls.
Moving on to 5Ds is expected, doesn't really bother me if it doesn't change the core gameplay.
I don't think the bikes come into it outside of minigames, but then the only 5Ds game I've played was the trial of the XBLA game which was like the World Champion games.
Considering the series at this point is nothing more than an advert for the cards I'm not sure if the bikes even change the rules out all. Though I haven't actually watched 5Ds because Yu-Gi-Oh! is a shit series.