The main problem in our country is corruption, so the more partners you have in a government the more chances are there for corruption. That doesn't mean a single party with the majority cannot indulge in corrupt practices. A single party has a single party head and has control over the entire party organization, but with multiple parties, every single of them has their own head and have their own agendas.
It is always tough to manage coalition governments since there are internal bickerings among coalition partners all the time. Though there is a common minimum program to rule the country, the maximum time is spent to cater to the demands of all the coalition partners. We have seen the situation during 1996-99 when the United Front was in power. After this, a very large coalition, the NDA, was effectively managed by late Mr A B Vajpayee. Between 2004-14, we have seen the functioning of the UPA. When somebody has an exceptional leadership capability, she/he can manage tough coalition partners also but it is not possible for all the leaders to run the coalition government effectively.
Therefore, I would say, whether it is a multiparty coalition or a single party government, a visionary and capable leader is the need of the hour.
"Life is easier when you enjoy what you do"