A wide range of customers talk about Caspian Sandwich Bar in terms of the flavour of the sandwiches, the overall quality of the food and the nostalgic feel of Iranian fast food. In several reviews, people specifically mention the tastiness of the burgers, hot dogs and distinctive sandwiches such as tongue. Among the recurring points, customers often highlight how generously filled the sandwiches are, the freshness of the ingredients and the popularity of items such as the special burger and special hot dog. Some reviewers also describe the place as a good option for experiencing Iranian-style fast food in London. In a significant number of comments, the friendly manner of the staff and the pleasant interaction with the team are also repeated as positive aspects.

Alongside these positive points, a number of users report less consistent experiences in the quality of certain orders. In a few reviews, there are differing views on the freshness of the baguette bread or the amount of filling in the sandwiches. Some customers also mention lower than expected co-ordination in the ordering or collection process, and there are comments referring to mixed experiences regarding pricing or methods of payment. In several separate cases, reviewers describe inconsistent experiences with telephone responses or staff communication, suggesting that the quality of interaction has not been the same in every situation.

In summary, the overall body of feedback about Caspian Sandwich Bar presents a balanced picture, where flavour, menu variety and the Iranian character of the experience stand out for many customers. At the same time, the repetition of themes around variability in bread quality, order handling and differing perceptions of pricing indicates that some visitors may have a different experience depending on the circumstances. Overall, the available data suggests that this business creates an enjoyable experience for many people, while in some orders the execution of details plays a more decisive role.