The popular ICO Market Research Q2 2018 ( https://icorating.com/report/ico-market-research-q2-2018/ ) Is a great read.
In it, it states the following Weaknesses:
Smart contracts are less flexible than that of Ethereum.
Smart contract execution is expensive.
Point 1 is correct but trivial. It covers >95% of what ethereum covers for much better security.
In the Strengths section they write:
Increased security: Stellar uses multisignature verification in its smart contracts.
Another extreme understatement...
Can someone educate me on the second point (expensive execution)?