Yes this is true, polarisers are often used for removing unwanted reflections and glare from glass or water so it will have an effect on the image (good or bad is subjective) but the versatility of it is incredible so a handy technique to know.
The other downside to this of course is cost, a decent circular polariser for a 77mm lens is around £150 so not the cheapest option either - then again each ND is £70-£80 for comparable quality.
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