The are many opinions trying to persuade people to believe that STEEM blockchain is a scam. Some arguments are “quite” convincing but in my opinion it does not matter because STEEM and STEEMIT are positive anyway no matter who profits the most and what will happen in the future.
Let’s take a look what characteristics STEEM has that make it unique and interesting.
1. Transactions cost: ZERO
Eliminating Transaction Fees
Steem goes to great lengths to reward people for contributing to the network. It would be
counterproductive to turn around and charge people every time they attempt to interact
with the community.
white paper
Each post/comment/edition is a blockchain transaction and it costs nothing to submit. Comparing it to Bitcoin where transaction fees are constantly rising and processing transaction can take a lot of time it is a no brainer what looks better. There was a time when you could sent Bitcoin with no fee at all and such transaction got mined and included in a block anyway, but those times are behind us. I have been playing around with 0 fees myself to learn a little bit more about the protocol and it was cool. I think 0 fees Bitcoin transactions are not processed anymore (if they are, they are very rare). 0 fee transactions on STEEM might worry a bit when it comes to spamming network and DOSing it this way, verifying accounts kind of resolves this, at least just a little I think.
2. Blockchain content: ARTICLES
3. Content curating: VOTES
4. Content reward: STEEM DOLLARS
5. Assets utility: MAGIC INTERNET MONEY
6. Other advantages: KNOWLEDGE, NEW SKILLS, INTERESTING PEOPLE
7. Proof of Concept complexity: SOCIAL MEDIA PLATFORM
Bitcoin - you can’t explain it easily even when it looks like a better money in it’s present form,
Ethereum - explain smart contracts to a guy on the street, even my friend - programmer for more than ten years now wanted me to explain ‘smart contracts’ term to him,
And many others - often very spicific niches with special use cases (Dash, Factom, Waves, Solarcoin, etc …)
Hard to make them mainstream, maybe even impossible.
* Steem - social media platform - no deep explanation needed
Simply put a mainstream blockchain KILLER APP
8. Entry cost: ZERO
This one is the most important in my opinion and wins any comparison. With STEEMIT you just sign up, get free assets and start to play around. You can even withdraw the initial amount you have been given, but there is a little catch here that it would take 2 years to completely do so.
Imagine starting your adventure with another blockchain where mining is very expensive and hard, no one gives you initial tokens for free and you have to buy them on exchanges where you have to create personal accounts and often verify them (of course there are solutions like ShapeShift but novices probably have no knowledge about this). Not even mentioning that people do stupid mistakes like sendings tokens to wrong addresses or mistaking fees amounts with values amounts and the token itself can just be a simple scam.
A LONG WAY TO GO for a simple user and it can be very discouraging.
On the other hand signing up for STEEMIT gives you over $4 worth of STEEM POWER.
Steemit verification partially eliminates bad actors from creating accounts. Social media accounts used for verification cost you 0$ (Let's skip here the fact that you have to give out some personal information when you sign up for facebook, reddit because you probably already shared it anyway.). However you can mine STEEM and create an account this way without verification process (I’m not sure if it is still possible), but this generates bigger electricity bills, so actually costs something.
Diving into STEEM costs you basically nothing but your time and should have only positive results in the end (of course when you don’t consider STEEM only as a speculative investment - here things might get crazy, do it at your own risk. Remember that this blockchain gives more than that).
Even if STEEM turned out to be a scam you would lose basically nothing, you could even get out with a profit and valuable life experience. Many blockchains didn’t survive, will STEEM survive? Personally I don’t give a f…. Even Bitcoin can still die. Blockchains are experiments. Right now everything seems to be working kind of as expected, gives a lot of fun, satisfaction and some MAGIC INTERNET MONEY too.
COOL, isn’t it? 
What does not kill you, makes you stronger!
LONG LIVE THE BLOCKCHAIN
P.S. Sorry for my English, feel free to correct me in comments. I hope you get my point, what is yours?