dunno man, 4 elements trainer pretty much just finished, and went on a high note. it did have its dev problems, but overall? it was a smooth sailing, with each "book" having its fans, and majority of players happy with the results.
as for something unlimited, for as much milking the guy does, the game has the content to back it up. so its a toss up there.
same can be said with rogue like, which, i do think its gone downhill, but again at least the devs didnt take time to make the game worse, so there's that.
glassix, harem hotel, come home and many other smaller, but long dev projects may not be as big, but dont seem to have gone bad either.
of course, we just lost another big one with venture seas(but lets be honest that game was fated to fail from the start with how borked it was).