The top dude is right. You can't treat a tablet like you would a pencil and paper. It's a totally different kind of media. It will never be like a pen and paper unfortunately. You just need to remember that you aren't using traditional media, you're using digital media and you just need to keep using it until your completely comfortable.
And if it's lineart that frustrates you, you can always pen out your drawings on paper, scan them and color them on your computer. Also, the cintiq is mentioned. It's a tablet where you can draw right on the screen... it's not easy switching from one tablet to the next, and the cintiq is still nothing like drawing on paper. It's still digital media. Here, this video can help describe a citiq better: [link]
for me, the biggest mistake I made was to treat my digital drawing like it was my paper drawing, working with lines and sketching like I do with pencil. The problem is not actually the tablet, but the way the digital brushes react. The're NOT pencils, or inks, or fineliners or markers, and yet for those of us who draw traditionally we keep trying to make it work that way.
For years I struggled with drawing with my tablet, instead drew on paper scanned and coloured. However recently I began to rethink drawing digitally and have started drawing in a way you can only possibly draw digitally and it has made my digital art much more alive.
I actually start drawing straight away in colour, somewhat like this [link] (only wip shot I could find)
So instead of working with lines, I'm working with shapes and tones and colours to define my work. Either that or I start with strong boldmarks and work backwards and erase them into the shape I want instead of draw them so it does this [link] -> [link] which is not a trace of the original sketch but a cleaned up version. Keeping the life.
That is something I could not do traditionally, and for me, why make digital pretend to be traditional when you could just let digital be digital.
You mean this thing [link] ಠ_ಠ That stuff cost truck loads of money. I think it's more of something that only professionals use (because they would be gaining more money if they buy it, thus, paying it off).
I've been using a drawing tablet for four years now and have had three different tablets (all by Wacom though) and I can concur nothing beats the good ol' pencil and paper along with other traditional materials.
However, perhaps a great way to cope with it might be to sketch out thumbnails in real life to get your ideas out, and then try to duplicate it on the computer, rather than do everything at once right there on the screen. There is also sketching out what you want, such as armour, and then taking a picture of it with your phone (or a scanner, if you have that), and using the computer to color it.
(I'm sorry if I'm rabbling too much - perhaps I got off topic.)