SickGear

So many false allegations in that review, each is addressed as follows...

1. Medusa is not new at all. Medusa is most Sickrage developers continuing from the name squatting Sickrage project. Sickrage squatted on the brand name of the original project to literally steal users from the original SickRage citing that it was "the new home", this was not true. Sickrage squatters rebranded to SickChill after quite rightly being forced to after the authentic SickRage author spent 2 years to reclaim its rightful ownership of its brand name.
2. SickGear does not use file size to determine a download because it is far more reliable without it. In fact, file size is a very poor metric that should never be used for reliable automated decision making.
3. SickGear does have full download error control when set up completely.
4. Poor series numbering support, there have been no issues reported that make a failure here.
5. There are no issues with "network transfers", however, one report shows a slower transfer on a particular NAS device, many NAS devices and RPi/BPi etc. are more than fine.
6. SickGear has never nuked files on a correct set up, however, it was possible to have files deleted by using it as not designed, and even that very rare kind of user misuse is now blocked.
7. SickGear has never had build updates suddenly not working.
8. Poor renaming functions (breaks with special character names), when the user OS (*nix) is set up for unicode then there is no issue, Windows doesn't require such intervention and most modern *nix' set up unicode (UTF8) fine too.
9. Poor developer attitude (arrogant and assuming), a basic level of computing understanding from users is "assumed". Otherwise much time is lost getting to the heart of an issue, considering many users, over and over again, wasted time soon adds up. Support and time is given free for this project. SickGear strives to remedy an issue as quickly as possible for the user, and are direct in doing so, however, saying that this is arrogance is both unfair and untrue.
10. No forums. Forums take even more time, server setup, continual maintenance, security, and of course money. There is the perfectly good GitHub issues tracker that people use which is owned and run by Microsoft.
11. Wiki/documentation, this has always existed and constantly evolves from user feedback. Questions asked are often answered with a link to the answer in the docs which is far easier for people to read and also saves everyone time as that doc text is often more detailed than what can be remembered in an answer that is typed in chat.
12. Issue resolution has always existed with an average 2hrs response time as reported from an independent monitoring service.
13. IRC requires registration, and so do forums and many chat/social/email services. Registration is required because IRC was attacked by a nasty spammer for weeks and weeks, many channels were affected, and the best way to secure against this was to enforce registration, many channels now require this.

It's good to answer misinformed allegations, 13 points seem pretty excessive for a normal user review, perhaps it is an assault to push new readers here to move on, medusa/sickrage people have brand squatted and worse so this wouldn't surprise me - even the last point about IRC is an oddly specific inaccuracy.

Aside from this, many people comment how they love the SickGear project compared to others. They appreciate the rock solid stability and highly rate the delivery reliability when looking at what the project serves to fulfill, fully hands-off automation with no downtime, no developer introduced bugs, and far fewer issues being raised than what plague other projects in this space.