@Ilan Keren-Zur the issue is that when you're added to a card, you automatically "Watch" that card, and when you're watching a card, you get notified about EVERYTHING that happens, it's very noisy. Also, when you comment on a card, there is a little checkbox that you can uncheck to avoid watching every card you comment on. You only have to uncheck this once.
Apart from that, I created Benko Board which (among other things) automatically unwatches any card you're added to so you only get notified about being added to a card, removed from a card or mentioned by name in a comment:
https://trello.com/integrations/#benkoboard
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