I just played Touhou 6 on easy with Marisa (cuz she's a cute witch and more so fits my play style when it comes to these games better). Pretty fun stuff! I actually managed to play it rather decently on this PoC comp I have. lol I only used two credits on this play through (some of the mans I lost were from rather stupid things, I admit).
Upon playing it (on easy anyway), it wasn't as impossible as I thought it may be (although there are still several moments of bullet hell even on easy). I think that, if I just played it more often, I'll probably do better.
But yeah, while I can't speak for the other ones yet (I do have 7 and 8 as well, thanks to Reggy), I am quite enjoying Touhou 6.