The first three. The first was a bit odd in the way it retconned a fairly significant event that should have been brought up by the other games, but at least it didn’t resort to amnesia to make the tutorial part plausible 
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The other two cases so far were really good (except for the music that played in the tech company, which had been fitting for the Hotti Clinic, but felt quite out of place in a less crazy environment).
I’ve started the 4th case, but with what was eluded to at the beginning of the game, I’m sort of wondering how that will play out. To tell the truth, I’m a bit at a loss during the first cross-examination, which is the reason why I’ve taken a break. Hope I’ll see things clearer when I come back with a fresher mind.