Going to a Michelin starred restaurant is the like going to a gallery to look at the work of an artist you like, at the top of their game seeing how they work, and maybe taking a few tips for your own work
They span the whole range of restaurants from cosy takeaways to absolutely pretentious places that should be burned to the ground.
There are many excellent restraunts that don't go for stars as its a pain and opens you up to a lot of criticism, and can break a business, if a chef realises they're mearly good instead of amazing.
Portions will nearly always be small, as you're there for the taste and not to shove your fat belly full of calories.
If you can you should really treat yourself to going to a couple to see how different "Fine dining" is when compared to anything else.
I always make sure to take a friend who loves her food photography, so I can take a break and concentrate on the eating.