Baseball games are still the most fun sporting events to attend.
Honestly, like any sporting event you're going to know less about what is truly going on as opposed to a TV or even radio broadcast. You really feel out of the loops in regards to knowing about an injury, umpiring decision, or any tactics that are pretty straight forward but not as obvious if an announcer isn't drawing your attention to such facts such as matchups, substitutions or keeping track of who is warming up in the bullpen.
Unless you've never been to Fenway I would never pay for more than 75 bucks for a ticket unless it was a lifetime opportunity to sit behind home plate, near the on-deck circle or possibly monster seats (although I've been told these are no better than glorified bleacher seats.) You're always better off knowing when tickets go on sale and getting them directly through the team or ticketmaster. StubHub/AceTicket are all ripoffs and I've vowed I will never use those sites.