I quite dislike Tokyo Station. It's huge and confusing for people who are on their first trip to Japan. At time of writing, there is a lot of construction going on, which makes getting around even more of a hassle.
Tokyo Station is also a notorious spot for bored Policemen stopping foreigners to check their IDs/Passports (Along with their pockets) Which is very surprising (the first time it happens and leaves a bad taste in your mouth).
Avoid when possible. Could be worse, but could be waaaaaay better.
There are good and bad points to Tokyo Station. The exterior from the Marunouchi Exit is a delight, and on a warm day, there are usually loads of aspiring artists sat in the shade painting the train station. Inside there are loads of the usual shops, plus a section that specialises in themed goods, for example, one shop just sells products depicting characters from childhood memory Moomin.
However, the size of Tokyo Station is beyond belief, and often, when changing here to a different train line, you can find yourself walking for up to twenty minutes.