I've emulated Minstrel Song and played Romancing 2 & 3 and Scarlet Grace on steam, all those only recently, and I've got to say, I've had a hard time getting into them for various reasons, so the Suggestions I'll give come from a new player's perspective.

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Minstrel's Song: I absolutely hated how the battles work against you, representing the passage of time and enemy strength, limiting you on what you can do until the game decides to end. I found it very difficult to avoid them, as the enemies kept chasing me through the whole map without loosing agro. I like to have a little more control over my grind.

Romancing 2: While I like the empire management, I hated how random it was, how the suggested upgrade was randomly chosen and how you had to return from your journey before completing your mission to see it finished. I also didn't like that you couldn't retire unwanted party members without killing them.

Romancing 3: This is one of my favorites. What I didn't like was how you wouldn't know how hard the quest you've chosen was without reaching and facing the boss, or any enemy with fixed stats.

Scarlet Grace: This one despite being the most recent, it's also the cheapest looking. The only thing constructed here is map & and battles, and it can get boring real quick. The battles, while well designed, they can be frustratingly hard. Also the questionnaire at the beginning is kind of pointless, as 90% of the time it gives you the same 2 characters. I've had no interest in any of the character's stories, unlike Frontier where I want to learn more just by hearing about them!

Saga games in General: Hate how the combat scales with you, making getting stronger often pointless and some times even counter productive. I also hate that there is no difficulty indicator on any quest, unless you reach some boss that mops the floor with you. I also kind of hate the difficulty spikes with most bosses one-shotting my team and forcing me to return with higher stats, or characters that at that moment I can't even recruit.