UDRS failure in world cup 2011

In the world cup 2011 the ICC has implemented use of UDRS . In the match of India against the England there was one incident when all the parameters met to give batsman out and yet he was given not out.

It was the over No. 24 and last ball of the over 
Yuvraj Singh to Bell, no run, Bell goes down very early to try and paddle one of those dinked sweep shots, ends up missing and is struck on the pads. Looks gone but Bowden gives it not out. India called for a review. Looks like it's given, all the replays showed it hitting and Bell is walking but NO!? Decision stays not out! Bell, apparently, was so far down the track that it remains up to the umpire
That's ridiculous if the ball met all the criteria to give a batsman out then he should have been given out. I was the supporter of the use of UDRS from the start but this makes me to think twice. In support of UDRS previously I did made a discussion at mylot " Umpire Decision Review System (UDRS) in the world cup".
The summery of the discussion was using UDRS in world cup reduce the bad decisions and give a fair chance to all the teams. As far as I know India has suffered from the lot's of b ad decisions in past using this technology might help , but after seeing how it is used in the match against England I doubt it will be worth to use. There is no snicko meter or hotspot to help the decision to be made correctly .
There was one  more incident of UDRS failure , it was in the Sri Lanka vs Canada match.

First, in the 23rd over with Jayawardene on 11, spinner Jimmy Hansra and wicketkeeper-captain Ashish Bagai went up for a huge appeal convinced an edge had been pouched.

The umpire turned it down, but Canada went for an immediate referral. TV replays suggested an edge, but were ultimately inconclusive and the decision remained. Then, in Hansra's very next over, they went up as Jayawardene attempted a drive. Again the umpire turned it down only for the second referral to be called and again TV replays failed to provide a decisive picture.

content source: http://www.espncricinfo.com/icc_cricket_worldcup2011/content/current/story/502226.html

I think the UDRS is going to be biggest blunder like Duckworth-Lewis Method. The UDRS  is like curse in the blessings.