This is a very simplistic view. There are benefits to approving things one dislikes slightly: like being able to influence decisions which are personally important. Rejecting things you disagree a bit with just because you can leads to being ignored. Like for example Orban - did anyone in the EU take this guy seriously in the past few years? EU more or less talked over his head (and the head of Slovakia as well)

and yet this is clearly not what has happened. you COULD make any decision hostage, but thats not what anyone does, as such, the veto has a very important purpose, and removing it would be betraying the terms that the union was based on, just because people are now members. its basically "I altered the deal, pray I dont alter it further"