It's all got to do with playing staff
Lions/Cheetahs start the year off with a few faces missing from the previous years CC side. They need to gel, but find it difficult in such a tough competition and possibly not enough time.
Roll on the Currie Cup of that year, they have more or less gelled and players have improved basic skills, resulting in better performances. Also they are up against fairly weaker opposition which further aids their players development
Come end of Currie Cup, some of the senior/talented players leave, meaning that the cycle starts again, especially as most players only sign 2-3 year contracts.
I hate how people so blatantly disrespect the Lions for thier performance last year, completely ignorant of how they had lost the spine of their team (Alberts, Ludik, Fourie, Mostert and for a chunk of the season Vermaak, along with a host of other squad players)
The Bulls of 2003 or 2004 would have lost just as many games as the Lions last year, so don't buy into this 'Worst team in Super Rugby crap'
rant over