Roman Legions seem too weak

[Tellos Athenaios]

Well that's what you get when you cite:

195 (Spanish Wars) Roman wins 3/ losses 0

Because a) (Minor point) It's not like there was one grand plan of conquering Iberia or sth.

More (Not compeltely 100%) like tribe x defies Romans rule, by god we shall send an army forthwith. Tribe x anihilates Romans and forces the retreating consul to accept the independence - by god we're the laugh of the whole of civilised world! Oh dear: they did it again!

Tribe x = Numantines, forcing the Romans in republic era to acknowledge their skill.

And there were others, who could do that job just as well too.

Because b) In front of people who actually worked to accurately represent such things as the Roman Legions, the Iberian tribes etc. etc.
Because c) You post a list which is worthless as source material because it gives you no sort of 'window' to refer to. The list doesn't contain casualties, army make up, terrain advantage for either side, etc. etc. And if history teaches us anything about military efforts, than it is that those tell us a lot more about succes or failure than the amount of battles you won or lost. And for the record: the campaign of Hannibal was one grand failure: IIRC about 50% of his troops were either gone or seriously ill before he even could begin with accomplishing any sort of objectives he had in mind. (Those 50% fell to: 1) Iberians who didn't like the Carhties crossing the borders; 2) Gauls who didn't enjoy it either; 3) Winter.)
Because d) You create the impression the Iberians can be brushed asid fairly easy: just look at Wikipedia - that'll prove me right and you wrong. And mind you as far as the Romans go Wikipedia even managed to get the duration of military service wrong. Ask Philip about that. -- Or look up the last debate on this Romans were the Best topic (Spears are very unbalanced thread).

EDIT3: As far as the seriousness and the ferociousness of the Iberians is concerned. Augustus (Octavius Caesar) boasts of being the first to competely have subjugated Iberia! And that's when...you ask? Well in his Res Gestae which is written towards the end of his rule as Princeps, so we talk 20 AD-ish. Also it's worth nothing that Iberia is explicitly depicted on the Augustus of Prima Porta (famous for the decorations on the cuirass, famous for being the Roman copy of the Greek Doryphoros, famous for being the arche-type of all (later) Emperor statues) alongside with Gaul, and Parthia. (Gaul and Iberia are mourning their loss, the Parthian king humbly returns the Roman standards taken from the previous Roman generals who attempted to conquer him.)