Definately don’t give up on St. Thomas Aquinas. The trick to reading him is learning his “language”, as he has a very unique manner of conveying his ideas. One of the things I’ve discovered about St. Thomas Aquinas is that he’s actually just stating the obvious 9 times out of 10, it’s just that he’s doing it in such a way as to shut down any potential arguments or misunderstandings before they occur. This leads him to use circuitous phrasing and arguments just to explain that God exists permanently and by virtue of His being God.
Read the summaries by others if you need to, and then go back and read the articles of the Summa in question. Pretty soon you’ll get a feel for how St. Thomas Aquinas writes, and from there the Summa will be a cake walk. An excellent writer for helping you get into the mind of St. Thomas Aquinas is G.K. Chesterton. He never wrote a detailed summary of the Summa, but his thinking style is very, very similar to St. Thomas Aquinas. The nice thing about Chesterton is that he wrote in modern English, making his work much more approachable for us today. It’s key to remember that when St. Thomas Aquinas was writing, he was writing in the ecclesiastical Latin of his day, familiar to all who could read, and his work was considered both definative and (relatively) easily understood. The fact that he’s such a difficult read today has more to do with our distance from his style and language, rather than any innate complexity on his part.
To use a Chestertonian expression, St. Thomas Aquinas is the Doctor of Common Sense. Keep that in mind while reading his work and you’ll have a much easier go of it!
Peace and God bless!