"I was disappointed. He has done so well for the country as well as for the IPL teams. He should be respected every time. It's about not me saying, it's the world saying," Raina told PTI in an interview.
Dhoni has so far scored only 61 runs in five games with a strike-rate of 87 and that has invited criticism from all quarters.
Asked whether it's affecting Dhoni, he said: "I don't think. He's back among runs. Hope he will do well better after two-three matches. We have only played five matches. After sometime the picture will be clear. He should bat up the order and bat long. He's a world class finisher."
"The time I spent with Chennai Super Kings will always remain special. We have won so many trophies, be it IPL or Champions League T20. When I was very young, it gave me a great learning opportunity by being among all the legends," Raina, who was the man-of-the-match in their maiden IPL win over Mumbai Indians in 2010, said.
On a different note, Raina seemed hopeful that Virat Kohli's Indian team will be able to retain Champions Trophy won in 2013.
Raina said that Kohli's aggression is his biggest plus point.
In order to get winning results, one needs to full support from the team and he has got that.
"Everyone supports him on the field. All the players like to play that way. If he starts scoring runs, I don't think anyone can stop him from winning the Champions Trophy. He has done well in Test and one-day cricket. Now it's time to go to England and do what MS did in ODIs (in 2013)," the Champions Trophy winner said.
"By playing IPL, I got over my hesitations. It created a positive vibe in me. Like you say cricketing instincts. You are in a good zone when you hit a bowler instinctively -- I developed that and dominated the bowlers."
Raina has picked Kerala pacer Basil Thampi and Jharkhand batsman Ishan Kishan as two special talents who would go on to play for India.
"He (Thampi) knows what he has to do on the match day as well as in practice. He has done really well in first-class cricket. He may get a look-in into the Indian team. He works really hard."
With Lions failing to replicate last year's performance where they finished table toppers, Raina said:"This time, we made some mistakes and we are not able to get our combination right. Bravo has been out; Jadeja could not play first two matches. It's a matter of posting one big win.
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