The aggregate rating of Britannia is build on scorse given by the following portals:
| Aug / 24 | Sep / 24 | Oct / 24 | ||
| cruisetimetables.com | 3.0 / 127 | 3.8 / 130 | 3.8 / 130 | |
| cruisemapper.com | 4.0 / 1 | 4.0 / 1 | 4.0 / 1 | |
| cruiseline.com | 4.4 / 264 | 4.4 / 266 | 4.4 / 266 | |
| cleancruising.com.au | 4.2 / 8 | 4.2 / 9 | 4.2 / 9 | |
| cruisecritic.com | 3.5 / 1 | 3.5 / 1 | 3.5 / |
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