I just recently finished Bioshock Infinite, and I had some thoughts about the gameplay mechanics. The original Bioshock was one of the first Xbox 360 games I played and I still think it's great. But I was a little let down by some of the non-combat changes in Infinite. I thought the hacking, photography, crafting, and alarm systems in the original were much more fleshed out and better integrated with the combat than Infinite's systems:

• stealing: This was only available in a few spots, and I'm not sure I know what the point is. If the text is red and you pick up an item, people attack you? Is that all?
• lock-picking: At the beginning this gates your ability to get to certain optional areas, but as the game went on I had so many lock-picks there was no point to having anything locked.
• choices: In a few instances, you are given opportunities to select one of two choices, but the result never seem to be anything more than minor differences.
• vending machines: There's not much to do with them in Infinite, unlike the original where you could, for example, hack a medical station to harm an enemy if they tried to use it.
• powers outside of combat: The original had some simple puzzles (or at least locked areas) that required the use of plasmids. In Infinite, there are only a few places you have to use a specific vigor outside of combat, and they're all in the same area.
• stealth: There isn't much opportunity for stealth, such as sneaking around cameras and turrets in the original.

On the other hand, I thought Infinite's actual combat was improved over the original:

• sky-line: This was great for moving around quickly and added to the strategies you could use in fights. It made the battlefield much larger and more dynamic.
• weapons: There's much more variety in Infinite, and since you can only carry two you can find yourself switching more frequently.
• vigors: They are all useful in combat. You can pretty much go with whatever you like.
• gear: A good replacement for tonics, and they definitely change how you approach combat.
• tears: Again, these add another layer of strategy.
• Elizabeth: She is actually extremely helpful during combat.

One final thing I thought was weird about Infinite: non-combatants disappear into thin air as soon as fighting starts. Streets that were full of people are suddenly empty. This occurs at the very first instance of combat.

Disturbing. Hilarious. Awesome. 
 
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