@Jaggu,
. MUL is the leader by far and not without reason. Obviously the fact that a few Swifts have water seepage problems doesn't mean that MUL has substantial quality issues... My sis has a Swift too and she's had no probs with it at all..
However, there are a small percentage of customers who do get cars with issues, and that points to some issues with standardization in terms of parts quality / assembly.