Now that people have played with Prince a little, anyone feel like it's a bit weak?
In more kingdoms than I expected, there either isn't any action to connect it with at all, or it's an action that's not super inspiring to play at the start of your turn or that you don't want to mass enough of to make connecting easy.
Okay, so let's assume that the kingdom has an action worth princing. Then there is a dilemma: to reliably connect Prince with the action you want, it's kinda necessary to have a decent engine going, but if you DO have a decent engine going, Prince is likely to be very slow relative to the game pace. Barring some fanciness with gainers, you need at least two turns that are hampered by setup: buying the Prince, and princing the action. In a draw-your-deck engine, princing the action can sometimes be a drag because you lose out on the action's effect on that turn. Engines also get less value from the reliability added by Prince, because they needed to be reliable in the first place to connect.
In an engine, Prince also loses value because, at the point you're able to connect it, what you typically want is to increase the payload of your engine, and Prince does not do that. Compare to KC, where if you need to draw your deck to connect it, that may still be OK because it can power a megaturn.
The uses outside an engine feel horribly unreliable. It may sometimes win the game, but surely it's lower expected value than just taking a Province.