Not trying to be an a** but this subject has been covered in every detail many times. Check out the search function. I say this just because you will be able to have all your questions answered in a much shorter time frame. You will be reading the rest of the night and half of tomorrow.
The Makarov is a terrific pistol. It is accurate, reliable, and very well made. I own three of them and was more than satisfied with every one of them. The caliber is basically a .380. Not litterally a .380 but it shoots about the same weight bullet at about the same velocity. The 9mm Mak is supposed to be slightly hotter, but in practical terms they are the same. They are absoulutly reliable. I don't carry mine, but I wouldn't hesitate to. What is it good for ? Plinking, informal target shooting, personal defense, small game hunting (where I live that basically means jackrabbits). The reaon the prices are so low is that they were manufactured in communist countries where wages are very low. They are also mostly military or police surplus guns. Believe me, if these guns were being made in the US, they would command a significantly higher price tag. If you are in the market for a relitively small gun, I would heartily recommend ordering a couple. You will be happy about it.
Don't even speak of a Makarov and a Raven in the same sentence. They are night and day.