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I've used a 70-300 for soccer, and it works. But honestly, I found myself wanting to go longer and ended up getting a 1.4x TC to go with it. Much more useful range (though sometimes now not quite wide enough) at the expense of slower initial AF, though workable. IQ took a minor hit, but not much, and in good light, was still fast enough. For that type of shooting, you will see just about zero difference from the extra 50mm, and now you've lost the wide end (that 50mm is huge!) If you want some serious reach, you can either spend some serious cash ($1000 and up) or get a high quality TC and learn to live with it's limitations.
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