RVN gave his first three points to the Leicester in the game against Westham. It's also his first game in Leicester City. He re-structured Leicester City's squad, helped team to perform more clinical, better chemistry, and sharpness. He finally gave Leicester City optimism to keep stay on EPL next season.
I think this is probably Leicester's best performance of the season. It's achieved after RVN joined them.
It's clearly from your statement you were underrating Leicester City. In fact, they're strong, they have quite good materials to start with, only lack of good manager, but they have solved the last problem when they sign RVN.
I mean Leicester wasn't in relegation zone, they were already above that level and I think what we are seeing is just a single game, RVN is doing fine and I do not disagree with that, but that doesn't mean that we are not going to see him keep winning games like crazy.
West Ham is a team just one place above Leicester right now, so they are close level teams, not like Leicester managed to beat Liverpool or something, there is no reason to be hyped like this over just one game. Not like they didn't get any wins before this game neither, Leicester had 2 wins before this game too, and got the third. Only if they end up playing good like this for a long time could they consider very good future, if RVN makes them win more and more, then yeah I agree it's a good move for them.