Worth it means different things
Some Amazon gadgets are worth buying because they solve a repeated problem. Others are worth buying because they make a room, a routine or a gift moment more fun. The problem starts when buyers expect one and get the other.
The safest products are usually the ones where the core benefit is obvious before you click buy. That is why practical gadgets often age better than novelty-first ones.
Practicality usually wins in the long run
A practical Amazon buy like motion sensor lights or a fast kitchen thermometer usually justifies itself for longer than a novelty product. That does not make novelty bad. It just means you should buy it for the right reason.
A galaxy projector can be worth it if you want atmosphere and know that is what you are paying for. It becomes a poor purchase only when you expect it to perform like a practical room upgrade.
Reviews are useful for spotting weak points
The most useful thing buyer feedback does is surface the trade-offs: build quality, setup friction, noise, reliability or whether a product is more niche than it first appears.
That is why honest review pages matter. A product can still be worth buying even if it is imperfect, but you want to know what the compromise is before you spend the money.