Well the problem of not mentioning "I think" is when you pretend that "X does not work" while 99% of your peers use it and do not seem to have a significant problem with it. Then the statement makes more sense if you phrase it "X does not work for me" or "You may like X but I don't", since it would then seem that you are a very unique person with a very unique problem.
If you had this kind of statement in other fields, like "Gaming on Consoles is broken", no doubt you'd get tons of people saying that this is wrong, because obviously millions of people have no problem with it.
Making such absolute statements is akin to trolling.
