No no Nooooooooooooooooooooooooooo!!!!!!!!!
Yes, it was the sequel, but it was in no way whatsoever, better than 'Alien'.
'Alien' was an absolute Sci-fi CLASSIC!
The word 'classic' is bandied about far too easily these days, but 'Alien' is one of the few films that actually deserves to be called a classic. You only have to mention 'the John Hurt Moment' or 'the Chest-Buster Scene' and everyone instantly knows what you are talking about.
It has gone down in Cinema history as THE definitive Sci-fi?horror movie, and deservedly so IMO.
Aliens - on the other hand - is a great action/monster movie, an excellent film in it's own right, but no more than that.
Don't get me wrong - I loved Aliens, and Alien3 too (the 4th - 'Resurrection' was pap) but neither could hold a candle to the first one.