For me it's like that:
1.
2010-the most amazing interval act ever,it gave me goose bumps,and it had a nice message,to see so many people from so many countries dancing + filming from every eurovision participant family dancing it was amazing!
2.
2009-expressive,great,it showed everything about Russia and also gave me goose bumps
3.
1994
Although the costs of producing the 1994 contest was only half of what the previous year cost, the success of Riverdance ensured that is was by far the most commercially successful Eurovision ever.-> that means something
4.Finland 2007