How deep is Ghana's Democracy?

In 1992 Ghanaians went to the pools to choose a new present and parliament after 11 years of a PNDC dictatorship.

In 1996 Ghanaians went to the polls again to choose a new president and a new parliament and the process was repeated in 2000 in which the opposition NPP won the election. After the successful 2004 and 2008 elections is it obvious that Ghana is charting a path of democracy. 

But the 2008 elections revealed a deep seated animosities within the NPP and NDC. 

Giving the tension that we saw in 2008 elections and its potential to derail the the constitutional governance that we enjoy, is Ghana's democracy just on the surface? In other words how deep is Ghana's democracy? Can anything be done to prevent the tension we saw in the 2008 elections?