I never saw an episode of Monali... so can't comment.
Meenal - the judges thought that she could not connect with the audiences and that was why she kept her eyes closed during her last performance, when it was really because she was so engrossed in singing her song well. She was in the bottom three FIVE times - in fact, there was only one gala in which she was not in the bottom three. Elimination finally caught up with her.
Antara - Her performance of Bairi Piya was not one which should have gotten her into the Bottom Two, when Sandeep and Anuj had performed not so well. I for one believe that she was not completely out of sur in the Shaadi gala... I don't think she deserved to leave at that point, and the judges were too harsh on her and slightly softer towards weaker contestants. The audience had turned their backs on her and she was voted out.
Neha - she sang a lively song, knowing that she could and would do well, and hoping that the audience might like her performance. Farah Khan and Sonu Nigam slammed her performance, even though it was perfect (according to Anu Malik as well). They said that it was "too easy" for her to sing!
Anuj and Ravi - the judges both discouraged them at all times. Ravi managed to give his all to his final performance, but was voted out due to the anger of Panna fans. Anuj, who the judges brought back, was called not passionate about singing, and this combined with each Amey fan not voting for him, got him out.