It's an amazing port that could do with a bit of modernization. It works out of the box with a controller though, so that's great. And the characters are all here, the stages, the moves, everything. It really is the definitive OG Mortal Kombat experience.
The problem is the AI. You can go to the settings and turn it to easiest but you'll still want to rip your hair out. The AI in this game is, without a shadow of a doubt, DISGUSTING. And you can't do anything about it but accept it. So the sooner you accept that the AI was specifically programmed to react instantaneously to your input and there is no way you can EVER react faster than it, the better.
There's a way to circumvent this, technically. That is, learn the moves, look for openings and strategize. Learn how the AI works and use it to your advantage. The game isn't impossible to win. It's just very hard (especially if it's your first time). It must've taken me like 1 or 2 hours to beat the NOVICE ladder. On easiest difficulty, the AI is ok for the first 3-4 fights, but after that, it can become a sh*t-fest.
CONCLUSION
I wouldn't buy this for 10 euros though, that's for sure. It's a fun game but it doesn't have as much replayability as the later ones. The blatantly unfair AI is ripped straight from the arcade machines, back when these things were specifically programmed this way so you could spend more money on retries. I recommend you either get this on sale or just leave it be and play a MUGEN game (which is free). They're leagues above these old games in terms of both graphics, sound, roster, everything. Just google "Mortal Kombat Mugen" and you'll have access to an ENDLESS supply of fan-made Mortal Kombat games that look, sound and play just like this, but better.