It's not for everyone. I've been playing over a year and love it, but some people can't get past the learning curve. Personally, I used the Lazy Newb Pack (adds tilesets, isometric graphics (stonesense), music, sound, and some other things) for a few months before I got into the ASCII. Tilesets are a good option if you initially find the ASCII a bit too hard to overcome. If the ASCII is your issue, then yes, by all means, use the Lazy Newb Pack. (It sounds derogatory, but it really isn't. It's just all the best mods gathered into one place.)
Link here.Yes, the only way to interact with the game is via keyboard, except for a few places. You can designate areas to be dug with the mouse, for example. The UI is, by itself, unimpressive, but that's because the game is written by one person, and that one person decided gameplay and detail were more important than superficial things like graphics and fancy GUI. (or, let's be honest, much GUI at all.)
If you find it difficult to get interested, and if you haven't yet, read Boatmurdered. It's a Let's Play hosted at lparchive.org:
Link here. Many DF players consider it the greatest DF story ever told, and it works wonders at helping a new player understand the game.
Some players don't really play much, and instead just love the community for the stories and fiction that DF produces. If this might be you, I'd suggest you head to the Community Games and Stories board at some point:
Link here. It's a lurker's paradise, honestly, and it also offers plenty of opportunities to play games with other people.
If none of the above sounds like something you're interested in, then it might simply not be your type of game. Every game has its fans, as well as people who just can't get into it. Assassin's Creed, for example, can't keep my attention long enough for me to finish it - I find it too repetitive, though I understand many other people greatly enjoy it. If you don't like DF in the end, then hey - at least you gave it a shot.