Funtouch OS 15's "sucks" perception seems to stem from its perceived limitations compared to other Android skins, particularly its perceived lack of features and customization options. While some find it close to stock Android, others miss the advanced features and customization found in other popular skins like One UI or OxygenOS. 

Here's a more detailed look at the criticisms:

1. Limited Customization and Features:

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• Lack of advanced features:
• Funtouch OS 15 is often described as having fewer advanced features compared to other Android skins, such as One UI or OxygenOS. This can lead to a feeling of the OS being "barebones" or less feature-rich. 
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• Limited quick settings customization:
• Some users find it difficult to customize the quick settings panel, forcing them to navigate to the settings app for changes, according to XDA Forums. 
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• Limited lockscreen media controls:
• The absence of lockscreen media controls is another point of criticism, says one user on XDA Forums. 

2. Performance and Stability:

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• Occasional glitches and bugs:
• While some users report smooth performance, others have encountered occasional glitches and bugs, according to a post on OnePlus Community.
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• Potential for battery drain:
• Some users have reported that Funtouch OS 15 can lead to significant battery drain, especially with certain features enabled. 

3. Bloatware and Ads:

• Pre-installed apps and ads: Some users find Funtouch OS 15 to have a lot of pre-installed apps and ads, which can negatively impact the user experience. 

4. Preference for Stock Android vs. Custom Skins:

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• Preference for stock Android:
• Some users prefer the simplicity and minimalism of stock Android, which Funtouch OS 15 is sometimes perceived to emulate. 
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• Desire for more advanced features:
• Others prefer the advanced features and customization options offered by other custom Android skins. 

5. Comparison to Other OS:

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• Comparison to One UI and OxygenOS:
• Funtouch OS 15 is often compared unfavorably to One UI (Samsung) and OxygenOS (OnePlus) due to its perceived lack of features and customization options. 
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• Comparison to OriginOS:
• Some users prefer the look and feel of OriginOS (Vivo's other custom skin) and find Funtouch OS 15 to be less appealing. 

In summary, the negative perception of Funtouch OS 15 is largely based on its perceived lack of advanced features, customization options, and potential for bloatware and ads, compared to other popular Android skins. 

@NipunMarya

@RockyFTW

@sharon