I've used a lot of wallpaper in the duration of my still short decorating career. It gives so much visual impact to any space without much effort. Unless of course, you'll be the one to install then that is so much effort right there. Haha.. There are some stigma to wallpaper these days, since it's not as easy to replace. Plus all the 80's floral wallpaper we've seen and hated --- with matching floral curtains with matching floral bedding set with matching floral dress! haha..
But I still love it nonetheless. If you found a pattern and color you love then go for it. If you're afraid to commit for an entire room, just install it to one accent wall. Just look at his home office set up. Loving the tribal print with those red-orange and pale blue. It's the perfect backdrop for an instant creative space.