Taurus makes good, well-designed guns that sell at a reasonable price. The problem is that their quality control has not always been what it should be, with the result that different people can buy even the same model and have widely varying experiences. Or a person can buy different guns at different times and have the same situation.
Before someone points out the obvious, any company can put out a lemon; any maker can have broken parts or premature wear. But Taurus, based on both network comments and some personal knowledge, seems to have far more problems than other major makers. They have often and repeatedly assured the firearms community that the problems are known and have been resolved, with steps taken to prevent recurrence. Unfortunately, problems are still reported (though I think fewer).
I don't "hate" Taurus, and I am not sure anyone else does. But the company has a reputation for unreliable products in an area where reliability is paramount. Hate? No. Making a choice to buy elsewhere? Maybe.