The microtransactions are one issue among many. To be frank, putting microtransactions in a $70 USD title would still warrant negative reviews in and of itself, but the the game is also having catastrophic performance issues and crashing on PC for what seems to be the majority of players, to the point of many Youtube channels covering it that did not get press copies being all but unable to play at all.
It doesn’t matter if a game has a lot of good elements, if it has bad ones and people cite those bad elements in negative reviews it’s not review bombing, it’s consumers giving an honest review of a product.
What, don’t you enjoy the incredible feature of your car being a rolling computer that constantly gets over the air software updates? Don’t you want to experience the joy of being stuck waiting for a forced Windows update, but instead of your computer it’s your car? Why would anybody not want this incredible and so clearly beneficial experience?!?