Yeah I know, tells a lot about 3200MMR doto 
Once you're fighting players with higher mmr, that tactic shouldn't work anymore that easily. Well, "should", there are noobs in every mmr-range, probably even those who have 5000~6000.
For example SyndereN has about 5,7k mmr and we all know he's not the best player (though of course he was playing as a pro for years and is still playing many games a day cause he's streaming).^^
Try heroes like Batrider, Beastmaster, Necrolyte, Enchantress, Magnus, Tusk, Timbersaw.
High game impact but not always late game carries, but certainly they can change a game.

And they are "giving" you the most fun.