So far, I think it's absolutely worth it. Yes it's a touch unpolished here and there, and needs a bit of tinkering, but it's also highly feature, settings and content rich, with tonnes of play for your money. The game is very well paced, fun, detailed, and has a highly rewarding driving model and physics engine. It also looks very pretty, and the vehicles sound fantastic. I haven't sunk enough time in to it to form any final judgements yet, but all I'll say is that the whole thing feels a little more serious than console sims like Forza or GT, but the price you pay for that is slightly less accessibility That's not necessarily a completely bad thing mind, especially if you want the game to serve as a compliment to Driveclub.
Regarding screen tearing, after about 4 hours of play, I've probably only noticed it maybe twice, so basically it's a non issue.