The last season was pretty ridiculous. The first season was simply terrific. Season 2 was pretty good too, and I mostly liked season 3. Generally I think the show's weak link was the whole conspiracy with "the company" (or whatever they called it) - the more the show focused on breaking out of prison / being on the run and kept what was going on with "the company" vague, the better it was. The more the conspiracy and the company came to the forefront, the worse the show became. I think that was sort of its flaw - in order to keep the main characters likable and have the basic plot work, you couldn't have Michael breaking his brother out of prison if his brother really was guilty and still have Michael be seen as a likable character. Ergo, enter "the company" to frame Lincoln. Also, the Michael / Sara romance was a bit too far-fetched. But other aspects of the shows premise - the tattoo, a civil engineer with the blueprints of the prison being locked up in the prison, was pretty ace.