It is a nicely designed boardgame but if you have never handled miniatures before, you will most likely be frustrated with ToI. One, it is tedious putting individual troops onto the base. It can turn out to be frustrating and if not careful you can snap the peg. I never allow a newbie to handle the troop building part because of this problem. Thankfully, I play mostly with friends who are into miniatures game.
The scenarios that come with the game are more often than not, unbalanced. If you can find the ToI map editor, there are many fan made scenarios that are better designed.
Setup takes a looong time. There are tons of fiddly bits
Those are the negatives. The game is best for intermediate level. The rules are not overwhelming but not simple either. For example, there is no facing but there is the concept of line of sight. The components are beautiful and there are a ton of bits that help keep track of effects and such. The game is highly customizable. You can create your own platoons within the confines of the scenario. The cards enhance gameplay but does not run the game.
Overall, I like it especially with the Fox expansion and the scenario book.