David Sirlin, the main person behind the rebalancing of Super Street Fighter II Turbo HD Remix, states the problems he thins Street Fighter IV is suffering from.
From the article: "Next is the 2-button throw, a bad idea in fighting games with 2D gameplay. 3D Fighting games are different beasts, so they are excused here, but note that even Dead or Alive offers a macro to turn its 2 button throw into a 1 button throw...and maps that macro to a face button by default. Anyway, 2 button throws solve a non-problem that no one has ever actually had. That's the problem of accidentally throwing and being sad about it. Street Fighter 2, Guilty Gear series, and Street Fighter Alpha 2 all demonstrated that 1 button throws work just fine and don't actually create any problems. Adding a second button press just adds complexity where it's not necessary, and helps nothing. "
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