Need to contemplate on the points below- 1.Taking more time is not a sign of weakness or even strength. A kidnapper can kidnap a child in a minute, whereas any good police force may need few days to find the culprits. Does the amount of time taken says that kidnappers were suceessful? Need more matured analysis on this Mr. Animesh.
2. Evil forces are always more powerful at start but end must not be ignored to make a judgement over who more powerful is?
3.Rama was not supposed to show his divine power as he was trying to give a different message in this incarnation of almighty. It was more about teaching the social norms, respect for paraents and subjects of kingdom any various other virtues.
Anyway, look at the bigger picture if you want to really understand all this, as your analysis sounds unfortunate.