everyone has had a lot to say so far, and there have been a lot of good points, but i think most of the people who posted dont understand the Abomination at all...first, yes he had his strength messed with in one of his past battles, however, this did not make him a whole new character or diminish his powers permanently, just during that one battle, Abomination has been totally destroyed and recreated since then (Tyrannus story) ; Abomination, was and still is stronger than than the Hulk at base level...
Next, how strong is he? the Marvel Universe directory published back in the day states that he is in the 100 ton + class...they also state that he is one of the most powerful beings on the planet, he is one of the few people strong enough to travel using a leaping method just like the Hulk too...Juggernaut cannot do this why? because he is not strong enough...his powers make him seem really strong when he is using his magic unstoppability, but he lacks the true strength to launch himself into the air for miles like the Hulk or Abomination...Abomination is not in 1000lbs weight class like Hulk, he is a bit smaller, like Juggernaut 900lbs...also, Abomination's strength DOES increase. What are his powers? increased strength, speed, durability, endurance...also he has vast healing abilities just like the Hulk...one time the hulk melted him into a puddle with some toxic radioactive waste or something and he healed from that. Also, his strength increases in a similar fashion as the Hulks; ironically, it is the more afraid the stronger he gets...however, as demonstrated by X-man, Abomination does not appear to have the Hulk's psionic defenses.