Best CURRENT theme song(s):
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- Randy Orton (my favorite current theme song, by a long shot)
- "Dashing" Cody Rhodes
- Edge
- Nexus
- The Miz
- Goldust (love the theme song, and his entrance)
- John Morrison (same as Goldust)
Worst CURRENT theme song(s):
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- R-Truth (by far the worst theme song I have ever heard. I literally feel like slitting my wrists every time he comes to the ring)
- Daniel Bryan (love the guy in the ring, don't know if the theme song is ever going to grow on me though

)
I could go on forever with best and worst theme songs, but since the thread said current, those are the one's that I can come up with. There is probably 1 or 2 more theme songs for each category, but these are all I can come up with right now.
Randy Orton's "Voices" is by far my favorite theme, I absolutely mark out as soon as it hits. I don't know why the IWC aren't that big on Orton, he's literally the only reason I started watching wrestling again, his current gimmick is one of my favorite gimmicks of all time. I actually think Raw is the best televised wrestling show I've seen since the Monday Night rating wars and Attitude era. I just want as many mix ups as you can get between Orton, Cena, Wade Barret, Miz, Daniel Bryan, Sheamus, John Morrison. I love the Raw main event scene right now. But anyway, back on topic ...
R-Truth's "Get Crunk is by far the worst theme music, possible even of all time. It's ridiculous that every wrestler of color nowadays has to be so stereotyped, whether its rapping, the way they dress and talk, or just their general gimmick. Not every black person is a thug WWE ...
On another note, flame me or not, I actually love Rob Van Dam's TNA theme.