I just see Russian grammar as too overloaded. Like those mega fries you can get in American pizza parlors. Sure, fries have lots of fat in them, but hey, let's throw on three different cheeses and some bacon with Ranch dressing on the side just so you understand how much fat is in them.
Maybe I like English grammar more because I was raised with it, and I do see it's flaws, but in my mind, it's way more flexible than Russian. We have no gender (so we don't have to worry about that when forming sentences... well except for she and he, and if it's something that doesn't have a biological gender... tah-dah, it's it.), virtually no cases (sure, we have some, but only like, 2), if you are using numbers in a sentence, anything over one is ended in either "s" or "ies", and that brings me to our plurals, which are just that, unless you are a scholar and you like using Latin words like "bacterium" (which most of the general public doesn't). The only con I can think of are our pesky verb tenses (yea, we went overboard on those, hehe).
Sure, Russian can change it's word order willy-nilly, but that's the only thing I can think of.
But what am I complaining about? I chose this as the language I wanted to study, and I'm far too deep to want to stop now. Yea, cases are just an everyday thing and I'm going to have to get over it, but it just seems like the English part of my brain is on overload and I want everything to act like it is in English (which is impossible, but I still wish)!