The T3 is a solid, basic DSLR. It doesn't have all the bells and whistles that the T2i and T3i have or quite the ISO range, but that doesn't make it a bad camera. Just a more basic camera at a lower price. It will give you control over the variables and it has solid ISO performance. It's got everything you need to make great images, you just have to supply the know how.
A lot of people say they want a camera to grow into, or that they've grown out of what they have. But to me really it's more a matter of wanting newer technology and/or more features. I know people who still shoot very happily with entry level DSLR's from 5 or 6 years ago. It all comes down to what fits you. No one else can tell you what fits you either. It's like shoes.. you need to try some on for yourself.
If you have the budget for a T2i or T3i you might give them a look. The features they have are really nice. But those features are not necessary to take great photos.