Here's a detailed answer from a guy who has watched every minute he played for years. Must warn you that the forum members might not like this answer because he's Messi's best friend and Latin American. So stop reading now if it makes you mad. This is a serious post and not a wind-up attempt (tbf I'm really good at that too).
His technical ability is massively overstated by some fans. Someone like Benzema has a better and more consistent technique in the buildup phase. Suarez is a far far better finisher than Benzema though. His shooting technique is superior.
His technique is extremely inconsistent and hit or miss. Suarez is capable of a sensational first touch. He's also equally capable of a horrendous first touch. He can pull off a great nutmeg. He also has countless failed nutmegs where he unnecessarily loses possession. He's a ricochet merchant and his dribbling is extremely untidy. He often hits the ball off the defenders' legs to win the ball in a tussle which isn't a reliable method. He is capable of jaw-dropping volleys. He's also capable of laughably bad shots.
The good thing about him was that he was very selfless and industrious. Even if he failed, he just kept trying. Had that Latin American hustle and hunger like Tevez. He's a massive trier. He's a complete team player and has no ego on the pitch. Suarez thrives in chaos not pure technical brilliance.
He relied on his burst of pace to ricochet the ball off defenders and take the ball away. Once he lost his pace, it was a lot tougher.
Why didn't he last long? All the strikers who lasted long were great at holdup play and strong in the air. The biggest weakness in his game was that he's weak in the air and can't play with his back to goal. He always prefers the ball to feet instead. That makes him useless at attacking crosses which is a big strength for old strikers like Benzema, Ibrahimovic and Dzeko who all aged like fine wine.
He was never really clutch for Liverpool. Consistently disappeared against the biggest Premier League teams throughout. For Barca, you guys already know the story so I'll leave that you Culers.
I can elaborate and analyse further if you want.