The whole calcium leaching and adrenal burnout is greatly exaggerated. But I'm not saying energy drinks are totally safe either, they do F with you to some degreee.
Regarding tabs, it's not the same thing. Tabs hit you too quickly and are crappy. It is no comparison to, say a cup of coffee in the morning. It's all about the administration. Plus there are many compounds in coffee that aren't understood by science, it's actually good for you in moderation.
Regarding large daily doses some people take, it's not exaggerated, it's true. People like to ignore/deny it in order to justify their "crutch"... all addicts (whatever the substance is) behave the same way.
I agree that caffeine tabs can hit you quickly, but it's dose related. If you cut the tab into 1/2 or 1/3, it won't do that.
All energy drinks have caffeine added (unlike coffee)... it's the same as taking caffeine tabs. Redline energy drinks average 39.5 mg of caffeine
per fluid ounce. If you drink the whole thing, that is a ridiculous amount of caffeine to consume at one time.