Virtus Pro was almost unbeatable in that version.
But after that IceFrog decided to make changes and the gaming community also wants some changes and their wish was fulfilled. The new version 6.50 came along with big changes in dagger and bottle, These changes were those type of changes which make version 6.50 into farming style. Almost every team picks up ultimate late game hero such as spectre, Terror blade.
But this version extends the game time and the gamers felt that DotA is becoming too boring to play. Then Icefrog decided to make frequent changes in most of the items and heros to take mass ganking style back in DotA.
Nowadays most of the DotA teams are looking forward to adopt ganking style. The reason behind this is the new items and heros were introduced and we are watching some quick games.
There is no doubt that Warcraft 3 Dota is the most popular and growing game in the Esports market.There has been competitive Dota all around the world and Garena helped a lot to promote this game. IceFrog and gamers also need to work hard to put this game in the most of the International Esports Events.