Solidity has a lot of potential pitfalls that need to be avoided, just like similar languages. Some of these are due to poor or unintuitive language design, although a lot of improvements have been made over time. The wallet bug involving Parity's multisig wallets was due to an error that Parity made, even if it's an error that may have been easy to make, it should have been caught in testing or code reviews due to how critical that library was. As far as the loop goes, you cannot have a loop that runs forever due to gas limits involved in transactions (a contract can only execute so many opcodes before it hits the gas limit and execution halts, with state reverted back), so it isn't a potential issue that it would never terminate. With that said Solidity still has some pitfalls that should be fixed, and many of them already have been fixed. It's not perfect, but it's quite usable compared to other smart contract systems, few of which are even as developed.

Most of the largest headlines involving loss of funds in the Ethereum network have been due to programmer or user error. Keep in mind that Ethereum is still in its "experimental" phase - it isn't "supposed" to have billions of dollars put into it just yet, but the market doesn't care about this as long as the prices are going up. Ethereum could be much worse than it is, but that wouldn't mean its value would go to zero, or even do down. Plenty of top coins by market capitalization have been orders of magnitude worse, or just outright scams. Remember "The market can stay irrational for longer than you can remain solvent".

It's still a very new area of technology despite the amount of money that pours into it. There's innovation, but it can be difficult to see it in the midst of the hype.