You play in the top MMR bracket, right, so I don't know if it's US servers or what but my observation has always been that games get easier to beat when enemies build their Shadowblades and I seem to usually lose when my teammates start building them. I never flame anyone for anything they've done in-game, but it's just been my observation that Shadowblades usually don't seem to work if enemies aren't awful or have their heads up their ass. I know that was just an example, but like I've said before, when you're being criticized for any build the reason behind it might not always be just "omg dendi builds other way u noob."
I might disagree with talkdota consensus of Alchemist though, because I imagine there's a chance some team(s) figure out a way to abuse his ability to farm a full or almost full inventory really fast and opt for a mid-game 'timing' push lineup. Hit the enemy with Radiance AC BKB Vanguard Alchemist when the enemy AM is still sitting on BF and Manta. But then again the reality of Alchemist's inherent weaknesses might kick in and he'll just be forgotten when the initial shock fades and people will get comfortable playing against him.