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OK so I'm an official Idena newbie now, one epoch old Cheesy
Must say that initial process is quite fun and not all that hard to grasp.
I have this one concern though; what happens if some douchebag starts to create completely nonsensical captchas, on purpose of course? Is there any fail safe against this? Would be a shame if someone was surprised by impossible captcha from the day one.

The correct answers are not predefined. There is no concensus in solving such senseless captchas, they are not qualified and thus excluded from the validation score. https://idena.io/?view=faq#faq-flip-creation-4

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Actually, that is one major problem that I am seeing here. Along the way, users will get tired of validating themselves and waiting for the exact time of this session. They might forgot later on that they have this app running and check for the next validating session. Sorry, but I think this is not a sustainable approach to retain your users. Let us see how many users will continue to support this after 6 months of using this app.

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It also seems to me that such verification will bother users. Moreover, there is a human fact where you can forget about the verification or not be near the computer in time.But Im still interested in what will come of it and I will participate.

The time between validations is a function of the network size. The bigger the network the less frequent validations. Will a validation once in three months be too much? Some people will be always more motivated than others to spend their time validating themselves and mining. Participants' motivation will also grow with the growth of the Idena coin valuation.