Sivaji is basically the typical Shankar story of one man fighting against corruption. This time he's fighting black money. The villain is pretty weak. Not memorable at all. I don't know how much someone not very familiar with Rajini's Tamil films would enjoy Sivaji, since it is in a similar vein, but on a grander scale (due to Shankar) and even references other Rajini films as well as his superstar status. Instead of his usual cigarette tricks we get some tricks with a coin and, IIRC, chewing gum. In that way its sort of a meta-Rajini film.
The songs are good, but most of the picturizations (except Athiradee) were disappointing. A lot of the comedy is pretty dumb, but I remember some of it being okay. Shriya has little to do besides being eye candy. Its also very creepy to see a 50-something Rajini romancing a 20-something Shriya
I thought Baba was a big mess. I haven't seen it in a few years, but the story was a mess, and Rajini and Manisha looked unenthused. Not even AR Rahman brought his A-game to this film.
I didn't see Chandramukhi.