It's fine to do some prep. Knock yourself out. The problem is coming onto a website and mentioning it. And I'm sure some of these rants are cases of people giving you honest advice.
A lot of times when a 1L or 0L asks about how much their are studying or their prep work, they aren't looking for an honest assessment. They're looking for someone to say "Wow, you're working really hard, you're way ahead of the game. You'll probably be at the top of the class!" And if you're coming on here to rip 2Ls for consistently telling you that you're wasting your time or this won't work (which isn't necessarily true), then you have a bigger issue: you allowed your confidence to get rattled, which won't work in a law school exam.
If you think you're doing good prep work, then trust yourself and do it, and don't care what anyone else thinks. Because if you do, you'll only get two real reactions: doing prep doesn't necessarily mean you'll do any better when grades come out, and that you're a gunner.