The best replacement for tekken 6 is soul calibur 4.

The best alternatives to tekken 6 are rated as following:
★★★★★  soul calibur 4
★★★★  street fighter 4
★★★★  virtua fighter 5
★★★  tekken 5
★★  tekken tag 2
★★  dark resurrection
★★  street fighter
★★  tekken dark resurrection
★★  dark resurrection psp
★  tekken tag tournament 2
★  soul calibur 5
★  street fighter iv
★  mortal kombat 9
★  ttt2
★  tekken revolution
★  soul calibur iv
★  tekken hybrid
★  ssf4
  tekken 6 br
  blazblue
  vf 5
  tekken dark resurrection psp

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Speaking about tekken 6, one probably shouldn't forget about arcade stick.

Other search terms related to tekken 6 and their ratings are:
★★★★★ arcade stick
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soul calibur 4
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