A multiparty setup has the advantage of encouraging a higher voter turnout. It typically ensures greater transparency in governance. A country with a diverse population is better represented by a multiparty system. However, a multiparty system can also fall prey to party manipulations and political agendas of diverse groups.
A multiparty system also encourages maximum participation from diverse political, ethnic and social groups. This can be an advantage if there is genuine desire to govern and legislate rightfully. Otherwise, very little gets done by way of governance and legislation, as infighting and political bickering prevents any real work from getting done.
A multiparty system can also bring a lot of experience into administration, governance and legislation. It can help foster a feeling of unity among the followers of various political ideologies. It prevents one political ideology from becoming the dominant ideology.
However, reaching a consensus on important social and political issues can become very difficult in a multiparty system. A legislative body may lack credibility if political parties and politicians with dubious pasts are a part of the legislative body. Party coalitions do not always work well, and this can often happen after elections in a multiparty system. In a multiparty system, a political party with a radical agenda can get elected to power, and this can prove to be catastrophic.