IT is. I have had to in some certain situations when i ran out of white or i forgot my sketch... they didnt turn out so well, and i had to scrap them. T-T Evil lined paper! the only good thing they're good for is writng.
You can get filters for getting rid of it. I personally don't like the thickness off lined paper though. It's not nice to draw on, let alone the final quality of the page...
The one thing, is i ODnt ahve a good painting program at the moment. My tablet stopped working on my laptop, (that has no internet) and it only works on papas, But papa doesnt have a painting program. Mom DID go buy me a painting program (Coral X) but at the moment its in America. And I'm not. so therefor i have no way to get to filters. Besides I still dont like drawing on lined paper, even IF there are filters.
I've heard good things about corel. I use photoshop CS2 at the moment, but I don't know many fancy things. I usually discover new stuff when I'm doing selling art and need to try something new out >.> gradient map is my friends however. That's a mode I TOTALLY love for fully rendered pics now ^^
I've only tried Corel Paint. And I really like it. I tired Photoshop at one point, and got lost, igendwie, But corel is good. I dont ether, Im kinda a biggener with Online Coloring, seeing as how i got the tablet for Christmas, and it no longer works on my laptop. ehehe..