Not excellently written, but a good plot.
At first, I thought the book was pretty good. Even in the beginning, I had my concerns about the writing...the story and the plot are good, but the execution of the book was poor. There wasn't enough character building and I'm sure, with such a good plot, the book could have been an instant hit if the writing was better.
I think it is better than Twilight though, as in Twilight, the books were all centered only around Edward Cullen and Bella Swan (Now Bella Cullen). However, the writing in Twilight, was better.
In Tiger's Curse, we learn a lot more about Indian culture and, generally, it's much more educational. I am an Indian myself, and I can see that the author has gone into a lot of trouble on research about Indian traditions, culture, food, and religions.
Overall, the book is okay, not very good, but it isn't very bad either. I was especially disappointed by the ending of the book. After building so much between Kelsey and Ren, the author's ending is kind of a rip-off to all the readers. Kelsey's choice was bad and unnecessary. I personally feel the ending was really, really disappointing. I understand that there's another book to the series, but I'm not very interested in reading it.
On the whole, my advice is: Try it out.