We're talking about your personal impressions between the 2 installments. Overall critiques deal more on specifics like bugs and plot sequences. However, what I'd like to know are your thoughts about the amusement you had. I personally think Borderlands was more impressive since the effects were novel and also the fun. Borderlands 2 was the better game, though, since it offers more diversity to the multiplayer category.
I was impressed by Borderlands 2. Well, the first part was a decent game but the second part was awesome. The graphics was much better.
I was far more impressed with the first one because it was all very new to me. With the two I already knew what I was going to play, but the first time it was full of surprises, so i prefer the first one.
I definitely enjoyed the feel and story of the first one more, but Borderlands 2 was way ahead of the first iteration when it came down to gameplay, realism and theory-crafting.
I think I would say Borderlands 2 just becuase I had some expectations with that one, and it surpassed those by far. When the first came out I really had no idea, so it was great but not really impressive, in that sense of the word at least.