Sure it can look dumb and makes the author look stupid too, but you are equally stupid if you decide to rate someones opinion according to how he/she writes instead of the accual substance.
When someone is purposely writing like a retard? Absolutely not. If you want me to read what you have to say then you damn well better put effort into putting that message forth. If you're going to write like a moron by using "words" like
u,
ur, 2,
4 or an abundance of the above mentioned acronyms just because you cannot be bothered to write the extra few letters then guess what, I can't be bothered to give a damn about what you have to say.
Retarded internet speak is almost an insult really. It's basically the other person saying "Hey my time is too important to take the extra few milliseconds to write the other 2 letters but I don't care about your time so instead you get to spend it deciphering what the fuck I'm trying to say".
Fuck. That. Anyone who wants their opinion taken seriously should make the effort to write with atleast vaguely decent grammar/spelling (to the best of their ability atleast). There's some middle ground between writing like you're in English class and purposely writing like a retard for the hell of it.
And yes, I probably am borderline insane for caring anywhere near this much about the issue but it just bugs the fuck out of me that laziness and stupidity has become some kind of virtue (or at the very least something socially accepted) on the internet.
Like I said, the ocasional usage of things like this in joking/ironic ways is fine. But people who actually routinely use this to actually communicate should just
diaf.