Comparing to Finnish is... a choice. Finnish is known to be one of the most difficult languages to learn because of the incredibly variation in cases.
Different languages have different features which make them harder to different populations. A better description of English would be: English is one of the languages to learn. English has no complex case system. We do not have grammatical gender. Our use of grammatical number is limited and consistent (except in certain loan words). There are exceptions to these, but they are largely words which are so common as to be part of the foundational learning -- pronouns, primarily, where we preserve gender and where case goes beyond "add an apostrophe-s." Because case is not especially important, word order is important, which can be challenging for people from cultures with a different standard word order. Spelling is challenging due to both the vowel shift and the number of languages which have acted as input to English (at a minimum: native Celtic languages in Britain; Anglo-Frisian and its antecedents; French, both Norman and more southern dialects; and Latin and Greek pulled in by the early natural philosophers of the early modern period).
English does have an unusually high number of irregular verbs, which, combined with the spelling and pronunciation, can make it seem inconsistent; but there are many other ways in which English is startlingly simple compared to highly-inflected languages.