They have a couple really good players but they're a minority in a team of mostly average to poor players. Lamptey will be amazing, especially in a team who can finish which isnt Brighton. Like HTT said their good players are Lamptey, Bissouma and Cucurella and Sanchez. None of them are going to win Brighton games, though.
Welbeck, Maupay, Gross, MacAllister, Lallana, March, Trossard etc etc are why Brighton dont perform well in the league. Their team is largely shite and they do over perform.