I don’t know why so many people have given Vodafone bad reviews , Maybe there are lot of members of the opposing faction like airtel and idea writing negative reviews about the because people are leaving them and buying Vodafone connections. I have been using the same number pre paid of Vodafone for five years without any problems.
Here are the factors which make Vodafone better than others:
No automatic activation of caller tunes
No sms by vodafone or other adversiting companioes , just sms Do not disturb to 111
No hidden charges
Best Network availability
No misleading schemes
The only factor might be that GPRS and some other features might be a little expensive although honestly at the end of the day Vodafone is actually cheaper than airtel and idea.