One thing that I really love about Dominion is that you can have a really strong board, with players building steadily towards a massive megaturn... only for one player to 3-pile and win 1-0. Brilliant!
Count Grishnakh, it sounds like you simply don't like the 3-pile rule. That's fine, and when you're playing IRL it's totally fine to play a variant. But here you'll definitely find yourself in a minority. To me it's no different than saying you don't like the game ending when the Provinces run out because another player might still have a chance to catch up with Duchies and/or alternate VP.
A hugely important element to a game of Dominion is timing. That is, knowing roughly how long the game has to go and knowing when to keep building your deck and when to maximise your points. Another element to that is ensuring that another player cannot end the game in the lead. If all players are keeping track of piles, as they definitely should be, a 3-pile win is not a sneaky move, because you should know roughly how many cards your opponent can gain in one turn as well as how many cards it would take to end the game. Surely taking this out of the game and having one less thing to worry about would reward skilled players less rather than more, right? If you understand the game and are paying attention, a 3-pile isn't dirty or underhanded, it's simply playing the game.