I just got back from the Sussex undergrad open day and liked it. It won't be my first choice or even my insurance when it comes to applications but it has a lot of positives. The campus may be a bit of a concrete jungle but the course I was looking at (French & Spanish/Italian) looks great and the students and lecturers were really helpful. Accommodation looks good too despite being a bit dated, but they said they're renovating a lot of it.
Also, Brighton is beautiful, and I love how arty and hip it is, which is a massive change compared to the boring town where I come from.