I have been playing these Pokemon games for over 12 years, so I'm quite a veteran by now rofl xD But, I would recommend these games to anyone new to the series anyway! I have played a lot of other different games too, for example on my Playstation 3 and XBOX (Prototype fan for example), but the games on these consoles NEVER were interested enough for me to play non-stop, that's why I stick with Nintendo from the beginning ^_^
I began playing when the Red/Blue series came out, and therfore have bought pretty much every Pokemon game after that, so I still have all the cartridges from Pokemon Red to Pokemon X now :3
I really grew fond of the games, collecting Pokemon, training them (takes a lot of time and effort, also very nice that even though you can catch more of the same Pokemon obviously, the stats and in modern games, and natures differ each time!), but also like the story. Sure, you may notice that the story barely changes throughout the games, but that's just what Pokemon is about!
I can't get enough of Pokemon, when I was a kid I liked the TV series a whole bunch too, and the great feeling of nostalgia and excitement, catching a rare Pokemon you have been looking for all day or finally encounter a shiny the first time! ^_^ Those days were awesome.
The gameplay can take you away for HOURS and even WEEKS on end, the story is large enough to continue to play as long as you like, and even after completing the main story, there is SO MUCH to do after that! My experience with other modern games like GTA or so, where nice games but I never could play those as long as Pokemon and still find new things to do that I haven't done before! I never experienced any game like the way Pokemon games are, there is so much to do in the story and even after that, there is plenty of stuff to do! Making these games totally worth buying! :)
So, if you are really serious in trying these games, I sure would recommend doing so! Sure, obviously the first games from Gen.1 are 8-bit/16-bit, not much colour variation, glitchy in a way because those where the very first games. Programming games is also a different matter and complicated so ofcourse there are glitches and stuff, but they are still worth playing! I'm FOND of my Pokemon X game, but I still like to play Pokemon Red now and then, for example!
The more variation came ofcourse when game development aged and became more sophisticated, so the more modern games have even better and longer stories, and ofcourse MORE Pokemon to collect and more playtime before beating the games! :) I already have played for over 300 hours in my Pokemon X game, and there is still so much to do (I never played for that long on any game in my life)!
But, it's up to you though ;) If you want to try, I welcome you and sure hope you will have great moments yourself with these games! And if you appear to dislike these games after trying out, that's fine too, but still, these games are definitely WORTH trying! Also, if you are really new to Pokemon I recommend to start playing the first Generation games to get to know the story and all the different Pokemon :) You dont have to start with Red/Blue/Yellow if you really don't like the older games, you can try FireRed and LeafGreen instead to start with, those are great remakes from the Red/Blue and Yellow series! :)
Good luck and have fun going to catch them all! ;)