No, no it's not. Umbrella is the better game.
You seem to be one of the few who think so. I prefer Darkside Chronicles myself, just because the experience in the stages is so much more immersive than Umbrella's (which often feels like you're riding a shoot 'em up theme park ride.
Incidentally, I'm replaying RE5 right now, and Sheva's dumbass AI aside (which, after already having done a full playthrough a year ago, I already know how to deal with the worst of) I'm probably enjoying the game a lot more now than I did my first playthrough (though the lengths you have to go to to prevent Sheva from interfering in trophy attempts is aggravating). I'd also forgotten just how hard that game can be, how easy it can be to run out of ammo in your first playthrough (especially since Sheva will only use a secondary weapon if her pistol runs out of ammo and she can't find any more). Unfortunately, I'm entering Chapter 3-1 now, the chapter where Japan's will-full ignorance of other cultures becomes glaringly obvious, as well as probably the chapter I enjoyed the least.
Oh yeah...RE4. Well, I'm probably going to pick the Wii version of the game up again sometime in the near future since it's pretty cheap now. About a year ago, I had to start getting rid of a lot of games I didn't wish to lose to obtain new ones, as I was unemployed for a lengthy period of time. RE4 Wii's turn is coming up soon.