The character's movement speed is, by and large, appropriate in relation to those of its opponents. If it is fast, it is so by no more than ~5-10%.
Once one gets used to it (vs. other titles out there), not a problem. Besides, the game is supposed to be fast. TL2's movement speed helps to put the Action in ARPG.
More people tend to complain about games like this being too slow, rather than too fast. It's a problem with many MMOs too, one that I hope Runic certainly takes into account if/when they go down that route, as they have alluded to previously.
Walking through large, already-finished areas at slow speed, in order to get to other parts of the map, is also tedious. I'm glad that's no longer a problem.
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