Maybe its tx confirmation speed?and blocksize  is too small for a lot of transactions every minute,needs some upgrade!

Being irreversible of transaction is the product of being decentralized. A great feature that carries an issue. Though it is not considered as a big issue. Just proceed with caution and carry more cautions

The thing that I do not like about Bitcoin is in the aspect of transaction also. It would be very nice if Bitcoin transaction could be done within seconds. But since mining a block requires 10 minutes at minimum we should wait for minutes, hours, or even days before our transaction be confirmed. Waiting sucks Another thing is that, transactions can be prioritized based from the transaction fee added. Perhaps a FIFO protocol should be embedded to the Bitcoin network so that all transaction is fair. Last is the increasing required transaction fee. This issue is absurd. (Nothing to discuss here, you all get the idea, right?)

I don't like very slow transaction speed unless I pay high fees.
I don't like high fees to be honest.

I think that we all agree on the same thing.. We all hate to pay those huge fees that we are always having to pay everytime that we want to make a new transaction.

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It is impossible to avoid them, haha, but there are some ways in that you can try to "avoid" them at some point, just like trying to use other exchanges or just those wallets who are paying a common fee between all the users.

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Like Poloniex, each transaction will cost you only 0.0001 BTC, that is less than $1,5 at the moment.

What I don't like about btc would be the people who uses it for scams and robbing people. Due to its high value people tends to get blinded by the idea that this is the easiest way to get rich. This is one of the reason why btc is being dissed in my country.

I really like the crypto currency because it is unique and can make a lot of money and can free the economic problems in my life, but also there are things I do not like from crypto such that if we miscast we will lose our money and hard to get back.

It is slow, it has expensive fees, it does not have soul and I don't like its name. I think it is enough

Bitcoin is not Stable
Bitcoin is a speculative currency. While there are not enough companies currently offering the purchase and sale of products with bitcoin as a means of payment.

I don't like the confirmation delays..