10 Most Successful Things WWE Borrowed From Other Promotions

Traditionalists have bemoaned the increased use of "themed" pay-per-views such as Hell in a Cell and Tables, Ladders & Chairs, arguing that matches of this kind should be reserved for the very best feuds, rather than whichever ones happen to coincide with their dates.

If they want to blame anyone for this, perhaps it's TNA, whose own Lockdown show - where every match takes place inside "Six Sides of Steel" - was around a long time before WWE decided to make them a part of their pay-per-view calendar.

For once, though, WWE haven't managed to do it better. In TNA's glory years, Lockdown (so long as the cage walls weren't electrified, of course) was almost always a genuinely terrific show which more often than not hosted match-ups deserving of the gimmick.