Reviewers largely see Slack as the default hub for team communication: fast, organized, searchable, and especially strong for channels, threads, file sharing, huddles, and broad integrations with tools like Google Drive, GitHub, Jira, Zoom, and Notion. Many say it works especially well for remote teams, startups, and day-to-day coordination. The main complaint is noise: too many channels, too many notifications, and threads or important messages getting buried. Some also mention a learning curve, clunky feature bloat, limits on the free plan, pricing pressure, and occasional performance or video issues.