Hungary:

• Non-proportional parliament (easy to get a single party majority)
• Single chamber
• President appointed by said chamber, not by popular vote as in some other countries

As you can see, the Hungarian system has a single point of failure – the majority in parliament. It is then no surprise that when Viktor Orban’s party won the 2010 election, where was practically no stopping them going on from there

Compare that to Slovakia:

• Also single chamber parliament
• Proportional system
• President elected in elections

Slovakia has just as shitty politicians as Hungary does but the fact that power in Parliament is distributed across a coalition plus the fact that their president is elected completely independently to that means that it is much harder for any single party to rule alone, unchecked.