I assume you mean this card?

The Papal Spearman is available for training starting in Age III.
Your complaint is that not being able to make an effective Rush against Italy a defensive civilization? Also, good economy? You literally sacrifice the entire Italian economy on upgrades to make up for the lack of villagers at the start.
Why do you think the Italian economy is good? also because you think it doesn’t need map control?, especially with how demanding it is for resources for the Lombards.
According to this App the Bersagliere does not have shadow technology that affects its speed, maybe your complaint is the ability?
It has the same shooting distance as a normal guerrilla, and also I see no difference between using the Lombards as a wall and having Bersagliere to fire against units or using the Dutch banks as a wall and having guerrillas to fire against units.
PS: Can’t the other civilizations attack by taking cover behind buildings?
Besides, your complaint is basically that the civilization is well thought out, having units that complement a strategy is good design, all civilizations should be equally well designed.
Cannon shots can’t be dodged, what are you talking about? This isn’t AOEII where you could dodge artillery.
Again, what shadow technology are you talking about? The Espingarda has a slight improvement in the attack with the industrial technology, which is not free.
Defensive FIs are not countered by attacking the opponent with a constant Rush, they are countered with an FI + economic boom that allows attacking with economic superiority.
In short, you are using the wrong strategy. 
The Papal Spearman is an Italian unit, it’s not a mercenary, and it’s not easy to use either, especially since it interrupts shipments, has a fixed number of 3 Spearmen per Papal “ship,” and requires you to have 300 of each resource.
Lombards don’t gather resources, they require a lot of cards to be profitable, they are theoretically the reason Italy only has one factory, and they also require a lot of micromanagement to be useful.
PS: Villagers gather resources, Lombards only transform them into half of the other two resources.
That doesn’t make sense, that would just make them more like a normal guerrilla fighter, plus you should worry about something else about the Bersagliere, but I’m going to keep that to myself, because you clearly have no idea how the unit work. XD
Of course, the Swedes with giant grenadiers, the Dutch with banks that directly give resources, the English with a housing boom that only requires wood and the United States with its invincible machine guns are clearly nothing compared to Italy.
The only thing I get from this conversation is that Italy is well balanced and there are too many people complaining without knowing how civilization really works.
The Lombards are not that great, they are unbearably demanding at the micromanagement level and they don’t give you anything, the Bersagliere are good, but they fall short with no cards in your deck to compensate for their late acquisition and the artillery only has an extra damage bonus in industrial, which is good for people who like revolutions.
Regarding the papal units, I think your complaint is unfounded, especially since Italy has the slowest start and needs to invest all its resources in improvements to not be left behind, you are almost never going to invest those resources in papal units, at best in Age III you send yourself something.