Good gameplay, OK storyline, Good graphics, but why is challenge mode easier than normal?

User Rating: 7.5 | Ratchet & Clank 2: Locked and Loaded PS2
So, Ratchet and Clanks 2 is one of the best games I have ever played. I started and after the first few levels I was hooked. The game has good weapons and an OK storyline. The graphics were good and I would have given it a 9 or a 9.5 if it hadn't been for one thing, challenge mode. The arenas were good too and that's where I spent the most time just goofind around in the challenges. When I went into challenge mode I went in thinking this should be harder that the first time... but no. I completed it in about half the time as the first time round as the extra powered weapons far outweigh the stronger enemies. So I would definitely reccomend this game. But don't play challenge mode it's a waste of time, and I found out the hard way. And don't waste your time trying to get all the skill points it takes waaaaaaay too long.