Arm out of window has it right. Lack of carb ice and carb heat knob is #1. This makes it worth having.
The only other advantage offered by injection is better fuel distribution which makes for a smoother, more efficient engine. Hardly noticable on a 540.
Contrary to popular opinion injection does not make the engine more powerful. Other things do that.
Fuel burn is adjustable and depends how it is set up. If you get an aircraft which is excessively thirsty, tell the engineer to sort it out - NOW. Its wasteful, clogs your valves, fouls your plugs and oil and is common.
The Raven 2 has other features which make it better than a Raven 1 but these are not down to fuel injection.
Disadvantages. Cost. Hot starting can be tricky till you learn how to do it.